Answer:
A Despite not explicitly discussing Hughes or his poetry, King etc.
Explanation:
As the title <em>Langston Hughes' </em><em>Hidden influence </em><em>on MLK </em>clearly shows, the central idea is the non-visible (at first sight) influence of Langston Hughes on MLK. Due to the fact that MLK didn´t explicitly discussed or mentioned L. Hughes, his influence is, therefore, hidden.
Verbs that refer to a specific action. For example I will keep in contact with you, this month. The precise verb for that sentence would be I will email you, this month.
