Which word and punctuation mark corrects the punctuation error in this sentence?

we opened the old wooden chest which was engraved with the initials "j. m."

a.
old,

b.
chest,

c."j. m.! "

(01.03 mc) what does the conversation between marcus and his father reveal about their characters? a marcus doesn't agree with the regulations put in place, but his father does. b marcus's father doesn't agree with the regulations put in place, but marcus does. c marcus's father thinks the regulations provide security, and so does marcus. d marcus wants stricter regulations to be put in place, and his father agrees.