Final answer:
Line (A) from Frost's poem shows diction, with the word 'yellow' helping to paint a vivid picture and suggest the season.
Step-by-step explanation:
The line from Robert Frost's poem "The Road Not Taken" that shows diction is (A) "Two roads diverged in a yellow wood". Diction refers to the choice of words and style of expression that an author uses. In this line, Frost's use of the word 'yellow' to describe the wood adds a visual element that helps to paint a picture in the reader's mind and conveys a sense of season, possibly indicating it's autumn. The precise word choices in Frost's poetry often evoke imagery and emotion, contributing significantly to the poem's tone and theme.