Carp Dium means to live in the moment, so answer (A.) makes a lot of sense.
so (A.)
Hi, this line has 9 feet, and this would be an "anapest" - u u / u u / u u /, "u" being unstressed syllable, and "/" being stressed. Here the only stressed syllables are: "light", "sil-", and "moon". The rest of them are unstressed.