In which sentence does the verb agree with the subject?

a.
a flock of ducks were flying toward the lake.

b.
the orchestra performs after this dance routine.

c.
the group lift the heavy box onto the truck.

To choose a good persuasive essay topic,begin with a big idea,narrow it down,and a.then narrow it down more; it is impossible to have a topic that is too narrow. b.do some research to see what you should write about c.specify-ask a question you want answered in your argument