Answer:
Option B is correct
4th degree binomial
Step-by-step explanation:
Binomial means it has two terms.
Degree means the highest exponent on its variables.
Given the expression:

In this expression :
There are two terms i.e,
⇒This expression is a binomial
To determine the degree:
Variables in
,
are a part of same term to determine the degree, we must add their exponents i.e,
In 
Degree = 3 +1 = 4
In 
Degree = 1+1 +1 = 3
By definition of degree:
Highest exponents is 4
Therefore, the given expression is 4th degree binomial