Answer:

B. 4

Step-by-step explanation:

You need to check on which term has the highest degree. To check the degree of a term, you need to add the exponents of each variable

1st term - 3(x^2)(y^2)

2+2 = 4th degree

2nd term -   -(x^2)(y)

2+1 = 3rd degree

Note: Exponent of y is 1.

3rd term - (x)(y)

1+1 = 2nd degree

Note: Exponent of both x and y is 1

Last/4th term -   -65

0+0 = 0

Note: Exponent of both x and y is 0