A negatively charged object X is repelled by another charged . . .

A negatively charged object X is repelled by another charged object Y. However an object Z is attracted to object Y. Which of the following is the most possibility for the object Z?
a) positively charged only
b) negatively charged only
c) neutral or positively charged
d) neutral or negatively charged

Video Solution : 



Hint : Repulsion is the surest test for the presence of charges (electrification).