A terminating decimal is a decimal that has a finite amount of decimal places.
For example, 1/4 is equal to 0.25, so it's a terminating decimal.
On the other hand, 1/3 is equal to 0.333..., so it is not a terminating decimal.
Looking at the options, the only one that represents a terminating decimal is option C.
(3/10 = 0.3)