Identify the Like Terms in the Polynomial $3 x^{4}+5 x^{3}-7 x^{4}$

Multiple Choice

Identify the like terms in the polynomial.
- $3 x^{4}+5 x^{3}-7 x^{4}$

A) $x^{4}$
B) $3 x^{4}$ and $-7 x^{4}$
C) $3 x^{4}$ and $7 x^{4}$
D) None of the terms are like.