Marcus wants to use a model to determine the difference

Question

−
8
−
3
(
+
3
)
. He starts with 8 negative counters.

The figure shows 8 negative counters inside a closed shape.

He wants to add 3 positive counters to the model without changing the value. How can he do that?

A.
add 3 positive counters

B.
add 3 positive counters and take away 3 negative counters

C.
add 3 negative counters