This is because it is an incomplete sentence. A sentence fragment is a format that <em>sounds</em> like a sentence, but isn't one. Sentences need a certain group of words, and this one doesn't have it.
The first one is c. the second one is c. 3rd is b. 4th is c. 5th is <span>"Take a look at my new hamster!" said Abby.
"Why is this door open?" her friend asked.
Abby ran to the cage, "He escaped!" she screamed. </span>6th is d. 7th is c.