Answer:
B.
Step-by-step explanation:
In her poem 'Barter,' Sara Teasdale has used the element of imagery to describe the loveliness of life.
In the given line, 'Scent of pine trees in the rain', Teasdale has used the element of imagery, that touches the five senses. In this line, the word scent touches upon the sense of smell.
Therefore, option B is correct.