Which of these is NOT a cause of the Chernobyl disaster? A. human error
B. faulty design
C. poor communication
D. reactors at high power

C

Explanation:

It was mainly a machinery issue and communication has no impact on how something is built

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.