The correct option is
A the/the/no article
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 to refer to a definite time ( afternoon)
In the second blank ,article "the" will be used because the speaker is specifically mentioning the 'afternoon wind'.
In the third blank , "the" will not be used because the word "difficulties" has been used generally and not specifically, describing the type of it. The articles A and An can't be used because 'difficulties' is plural. So, 'no article'.