All of these sentences are from the same paragraph. Which is the topic sentence? PLEASE HELP!!!!!!!!!!!!!!! I WANT TO SEE PROOF!!!!

A.
The signing of the Declaration of Independence made colonists feel united and determined to be free from England.
B.
After the Declaration was signed, it divided families as colonists took stands for or against English rule.

C.
The signing of the Declaration of Independence had many effects, both positive and negative.
D.
Because the Declaration of Independence was signed, the rebellion became a committed attempt at freedom.