An electric motor may be protected against short circuits by what means ?

Yes I agree with those who had answered A & C 

Thanks Mr. Labib

I think choice A&C

fuse as well as circuit breaker ..............

 Damage from short circuits can be reduced or prevented by employing fuses, circuit breakers, or other overload protection, which disconnect the power in reaction to excessive current .

So Answer is 

A. Fuse 

C.  Magnetic-only circuit breaker

Thanks Mr. Labib

I guess  Choice  D 

Protected by : A fuse or a magnetic-only circuit breaker 

I believe the answers are A and B

A.  Fuse 

C.  Magnetic-only circuit breaker 

C.  Magnetic-only circuit breaker 

A fuse can protect an electric motor from short circuit.