The correct option is
B the/the/the/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 'most' is a superlative adjective and article "the" is used with superlative adjectives.(concept)
Similarly, in the second blank, 'greatest' is superlative adjective, therefore, article "the" will be used.
In the third blank, article "the" will be used because article "the" is used when there is something only one (the moon, the sun, 'the world').
In the fourth blank, 'English' is not mentioned in the context of language, therefore, zero article or no article is incorrect.
Here, English word is representating a specific group of people. Therefore, article "the" will be used.