HELP PLZ TAKING A TEST PLZ HELP !!!! Which of the following sentences is punctuated correctly?

A.

Steven's wallet was about, to tear apart at the seams, hanging only by a single thread.

B.

Steven's wallet was about to tear apart at the seams—hanging only by a single thread.

C.

Steven's wallet was about (to tear apart at the seams) hanging only by a single thread.

D.

Steven's wallet was—about to tear apart—at the seams, hanging only by a single thread.