The correct option is
A The/no article/the
OPTION "A" is the correct answer.
EXPLANATION:
There are two types of articles:
DEFINITE ARTICLE (THE) : Article 'the' is used to refer to a DEFINITE thing or person.
INDEFINITE ARTICLE(A/AN): Article 'a/an' is used to refer to a thing or person in general. For instance: man, door etc.
Article 'a' is used with consonant sounds whereas article 'an' is used with vowel sounds.
In the first blank, article "the" will be used because article "the" is used with something only one (moon ,sun).
In the second blank, "no article" or "zero article" will be used because no article is used before individual adjective.
In the third blank. article "the" will be used because article "the" is used with something unique. (moon, sun)