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why is choosing strong nouns and verbs important when writing poetry ?

a strong nouns and verbs create specific imagery
b strong nouns and verbs create difficult imagery
c strong nouns and verbs create strong adjectives
d strong nouns and verbs create challenging metaphors

The answer is: [A]: strong nouns and verbs create SPECIFIC imagery.

Explanation:  Refer to the actual question:

"Why is choosing strong nouns and verbs important when writing poetry ?

Note the following text within the question:
  "strong nouns and verbs"; and:  "..when writing poetry?"

Let us examine the remaining answer choices:

→Let us examine "Answer choice B:  strong nouns and verbs create difficult imagery."
     →This is incorrect.  It seems not to make sense that it would be "important" to choose "strong nouns and verbs" to create "DIFFICULT" imagery.  The creation of "DIFFICULT" imagery would seems to confuse the reader.

→Let us examine "Answer choice C:  strong nouns and verbs create strong adjectives."
     →This is incorrect, since nouns and verbs do not "create" adjectives.

→Let us examine "Answer choice D:  strong nouns and verbs create challenging metaphors."
     →This is incorrect, since nouns and verbs do not "create" metaphors. 

This leaves us with: "Answer choice, A" as the best, and correct,

[A]: strong nouns and verbs create specific imagery.

{Note: This definitely makes more sense than: ["Answer choice: "B": the creation of "DIFFICULT imagery"]; which would tend to confuse or distract there reader [as mentioned above). The use of language [strong nouns and verbs, in these particular answer choices given] to create SPECIFIC imagery— which corresponds to: "Answer choice, A"—makes the most sense.}.