Read the sentence. Identify the rule for using the dashes. You are the friend—the only friend—who offered to help me.

a
To clarify
b
Change tone
c
Long pause
d
add a thought or opinion

i believe it may be the hope this sorry if i'm wrong.

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.

i cannot see any of the options

may i ask what topic?