It is (in his attic room)! Words like in, about, outside, between are where prepositional phrases start.
From...
pretty sure, that's the answer choice.
“They tied me up, then, plumb / amidships, back to the mast, lashed to the mast, / and took themselves again to rowing.”
The answer would be : to show the audience that he knows about many uses for herbs.
Hope this helps !
Photon
