The terms in I are like terms. This is
because both terms have the same
variable x2
Step 2
The terms in II are like terms.
This is because these terms have the same
variable x2 and y3
even though both variables are written in a different order.
Step 3
The terms in III are unlike terms.
This is because these terms have variables with different exponent (i.e. power).
Step 4
The terms in IV are like terms. This is because both terms have the same variable m
Step 5
The terms in I, II and IV
are likes terms. Clearly, the answer is
C.