Which sentence uses commas correctly?

a.
hearing her worried cries, we attempted to rescue the cat stuck in the tree.

b.
during the rescue several small branches, fell to the ground.

c.
while we are waiting, for the fire department, do not climb the tree.

d.
hey let's try to tempt her down, with some cat food.

Match the description to the term. 1. textbooks conference usage 2. elements surround a word which clarify the meaning casual usage 3. the way in which english is used context 4. family and friends frozen usage 5. friends at a football game formal usage 6. teachers and employers intimate usage 7. making an appointment usage