Answer: Option C
Explanation:
You know that when you multiply 5 and 6, the product is 30:

Let's check all the options:
Option A shows us that
, this is not true, because:

Option B shows us that
, this is not true, because:

Option C shows us that
, this is true.
Option D shows us that
, this is not true, because:

Therefore, the option that shows one one way to check the answer to
is the Option C.