Answer:
B
Explanation:
5×z= 5z
z×z^4 = z^5 because when the base is the same (z) and they are being multiplied together, you can add the exponents
4z×1z= 4z^2. because 4×1=4 and z×z=z^2
z^2 × y^2 = z^2 y^2 because the bases are not the same so you can not add the exponents