Answer:
B delete the comma after sure
Umm purpose I’m guessing , if It’s wrong then I’m so sorry
"Megan Parker keeps running to check her mailbox, she is waiting for a letter from my cousin."
Correct version
"Megan Parker keeps running to check her mailbox. She is waiting for a letter from her cousin."
A few words with the prefix pater/part are:
patriarch - head of the household
paternal - relating to the father
paternity - test to determine child's father.