Answer:
b or d
Explanation:
a. This
b. These
c. That
d. Those
When we talk about multiple objects, we say either "these" or "those". Therefore a and c are incorrect.
Both b and d are correct, depending on the situation.
For example: if we're in Sarah's room and we can see the toys, then we can use "these".
If we're not in Sarah's room and we can't see the toys, then we can use "those".
Although, occasionally, those words might be switched up.
It depends on the situation.