Question

bicker means to:
go together
argue over petty things
briefly enter enemy territory
act, usually en masse, hurriedly or on an impulse
progress: 10

Explanation:

The word "bicker" is a verb. According to the dictionary, it means to argue about unimportant things. Among the given options, "argue over petty things" matches this definition. "Go together" is about compatibility, "briefly enter enemy territory" is about a military - like action, and "act, usually en masse, hurriedly or on an impulse" is more about a hasty group action. None of these other options fit the meaning of "bicker".

Answer:

argue over petty things