judging by the answer options, we are supposed to use e as the nautral log base
so if we use e is natural base as in the one where ln(e)=1
and e≈2.718281828454590
e^4=(2.78281828454590)^4 or (2.78281828454590)(2.78281828454590)(2.78281828454590)(2.78281828454590)≈54.5981500331
the answer then would be the 2nd option, 54.60