Answer:
Fourth degree polynomial
Step-by-step explanation:
Given is an algebraic expression with 4 terms as

First let us arrange these terms in the descending powers of x.
We get

is the standard way of representing any polynomial.
This is a polynomial because x has powers only as non negative integers.
The degree is 4 since the leading term or highest degree term has degree 4.
This is a polynomial as this got more than 3 terms after simplification.
Hence Option B is the answer.