Which underlined phrase is a perfect participal phrase?

Read this line from the poem. and while i thus at random rove what effect does alliteration have in this line? a. it emphasizes the unpredictability of the speaker's pursuit of pleasure. b.it makes the speaker seem fair and impartial. c. it adds a lighthearted tone to the speaker's words. d.it contributes to the sorrowful tone of the poem.