Question

water on mars
like earth, mars contains plenty of volcanoes, and also like earth, most
volcanoes on the red planet spew lava. however, many space scientists
believe that mars may also have another type of volcano: one that gushes
mud from its opening.

mud volcanoes are not a new phenomenon, and they exist in various places
on our planet, including the ocean’s floors. what makes mars’ mud
volcanoes so interesting is that they are a strong signal for the presence of
water.

the possibility of water deposits on mars has intrigued scientists for some
time because a water source would be required prior to any permanent
human habitation. today’s astronauts bring water with them for missions,
but this would prove challenging on a lengthy mission to mars.

with future research into other water sources, such as a potential
underground lake, scientists are hopeful that a mission to mars may soon be
possible—perhaps only some ten years’ away. explorers on these missions
are very likely to seek out and confirm the existence of mud volcanoes and
the lake, which is believed to be some twelve miles across.

which choice makes the sentence most grammatically
acceptable?

select one answer

a no change

b todays’

c todays

d today’

Explanation:

The original sentence "Today's astronauts bring water with them for missions" uses the correct possessive form "Today's" to show that the astronauts belong to today (the current time). Option B "Todays'" is incorrect as the plural of "today" is not used in this context and the apostrophe placement is wrong. Option C "Todays" is a plural form without a possessive, which is not appropriate here. Option D "Today'" is missing the "s" after "Today" for the possessive form. So the original (No Change) is correct.

Answer:

A. No Change