Answer:
Option A and D 
 
Step-by-step explanation: 
 
A polynomial is the combined form of expression that contains variables, operations and exponents. It cannot be divided by a variable.Polynomial does not have fractional exponent. 
 
Option A is a polynomial because it contains variables x and y and operators like + and division 
 
Option B is not a polynomial because it have x in the denominator . Polynomial cannot be divided by a variable. 
 
Option C is not a polynomial because it has a fractional exponent 1/3 
 
Option D is a polynomial because it contains variables x and y