Where did Roman gladiators square off for combat against other gladiators or against wild beasts?

A- the Pantheon

B- the Circus Maximus

C- the Colosseum

D- the Forum

where's the

necessary and proper clause. the congress shall have power to all laws which shall be necessary and proper for carrying into execution the foregoing powers, and all other powers vested by this constitution in the government of the united states, or in any department or officer thereof.