Why would a writer shift from one grammatical mood to another in a single pome? to more creatively express common ideas
to help express the speaker's varying attitudes
to show a writer's purpose in writing
to explain the work's theme more clearly to the audience

i believe the answer is: b. mr. head had a long, tube-like face with a rounded open jaw and a short depressed nose.

this is because in the un-revised sentence it said that mr. heads face was long and tube-like, and he had a rounded open jaw. this is not a very grammatically correct because of how it seems to drag on with the and, replaced with, with, makes it sound more fluent in the description.

a

explanation:

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