What is the function of a semicolon?

it accompanies a comma.

it joins two independent clauses.

it introduces a quotation.

it separates a series of phrases.

It joins two independent clauses.

Explanation:

ex: Yes; no, yes, maybe, answer, UwU, and OwO

it is an infinitive phrase with a subject.

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.