Question

which sentence is punctuated correctly?
○ you will need the following ingredients milk, eggs, sugar, and flour.
○ you will need the following ingredients, milk, eggs, sugar, and flour.
○ you will need the following ingredients - milk, eggs, sugar, and flour.
○ you will need the following ingredients: milk, eggs, sugar, and flour.

Explanation:

When introducing a list of items after a phrase like "the following ingredients", a colon is the correct punctuation to signal the upcoming list. A comma would create a comma splice, a hyphen is inappropriate for this purpose, and no punctuation creates a run-on issue.

Answer:

You will need the following ingredients: milk, eggs, sugar, and flour.