I think its A. They establish this section's grim mood. Hope thus helps :D
Simple present tense of the verb adds 's' or 'es' or 'ies' to the end of the verb.
Such as: Joseph enjoy<u>s</u> cooking dinner. OR Mary miss<u>es</u> her parents. OR Tommy cr<u>ies</u> when he is sad.
C. Is the answer she did live to grow up to be a life long missionary
