theres a menagerie of frozen waterfalls, icicle chandeliers, crystal - encrusted archways, and towering…

theres a menagerie of frozen waterfalls, icicle chandeliers, crystal - encrusted archways, and towering stalactite pillars.\npictures of the ice caves have spread through social media in recent years, even though its no surprise that throngs of people are eager to visit them. 1 even the ice caves in the mainland cliffs (the only ones officially open to winter visitors) have no road access. after descending a long stairway to the lakes edge, visitors have to hike, ski, snowshoe, or dogsled over more than a mile of sometimes slippery, sometimes jagged ice to reach them.\nmoreover, the ice must be a minimum of at least eight inches thick for it to be safe. as a result, the caves can only be accessed during the most frigid winters, and officials close the park at even the slightest hint of thaw in the forecast. 2 for years at a time, in fact, the ice caves never open at all: they were closed for six of the ten winters between 2009 - 2018. but when its safe enough, park officials get the word out - and the crowds arrive. on the opening day in 2015, conditions were perfect, by noon, more than 2,800 people had left the mainland for the caves. they knew that this journey while not easy would be worth it.

theres a menagerie of frozen waterfalls, icicle chandeliers, crystal - encrusted archways, and towering stalactite pillars.\npictures of the ice caves have spread through social media in recent years, even though its no surprise that throngs of people are eager to visit them. 1 even the ice caves in the mainland cliffs (the only ones officially open to winter visitors) have no road access. after descending a long stairway to the lakes edge, visitors have to hike, ski, snowshoe, or dogsled over more than a mile of sometimes slippery, sometimes jagged ice to reach them.\nmoreover, the ice must be a minimum of at least eight inches thick for it to be safe. as a result, the caves can only be accessed during the most frigid winters, and officials close the park at even the slightest hint of thaw in the forecast. 2 for years at a time, in fact, the ice caves never open at all: they were closed for six of the ten winters between 2009 - 2018. but when its safe enough, park officials get the word out - and the crowds arrive. on the opening day in 2015, conditions were perfect, by noon, more than 2,800 people had left the mainland for the caves. they knew that this journey while not easy would be worth it.

Answer

Brief Explanations:

The original sentence "perfect, by noon" (Option A) has an incorrect comma placement. A comma is not needed between "perfect" and "by noon" here. Option D "perfect by noon" is the correct form as it is a simple description of the conditions being perfect at noon without an unnecessary comma - separation.

Answer:

D. perfect by noon