Diction refers to .

a) the repetition of phrases or sentences with similar structure or meaning
b) lines with irregular meter and length
c) words whose sounds imitate their meaning
d) word choice and arrangement

D) Word choice and arrangement.

Explanation: the denotation of a word is its literal meaning, the definition that we can find in a dictionary, a word can have several denotations (or definitions). The denotation or definition of diction is the choice and use of words and phrases in speech or writing, the style of enunciation in speaking or singing. So from the given options, the one that represents the definition of diction is option D: word choice and arrangement.

umm of course in fact ur getting your answer : )