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The correct answer is - When studying mythology, I learned about several gods and goddesses: Zeus, Apollo, Aphrodite, Hermes, and Hercules.
This is the only sentence which is punctuated correctly because the first part (before the list) ends abruptly; it is obvious that something needs to be placed there. In this case, that is a colon.
The other sentences have leading words (particularly, such as, were) that don't require a colon after them.
Answer:
Dear diary,
Right now we are all locked up inside because of a pandemic. It is a struggle, that's for sure! I really would like to see my friends, but I'm not able to because of the pandemic. Well, that's all I have for now.
Love, SandyvillSandyInACNL
Explanation: