I think it would be C) singing
In the final ten lines of the poem Il Penseroso, the poet aspires to a revelation of devine knowledge to inspire his great poetry. He will devote himself to solitude, contemplating. Among these lines he speaks about sitting in a "peacful hermitage" where "rightly spell" may refer to attachment to natural madic and an interest i the new search for an accurate scientific language. He wants to know and understand nature.
I can’t see the stanza, but generally, alliteration can help add mood and sometimes tone to the writing. The repetitiveness can add a cadence to the poem.
