Which punctuation mark belongs at the end of the sentence?

close the refrigerator door

a.
?

b.
.

c.
!

What is a major theme of harrison bergeron

Recommend four ways in which a person should approach conflict resolution in order to sustain healthy relationships

"alice wondered a little at this,but she was too much in awe of the queen to disbelieve it".what is the effect of the author's word choice in this sentence?