What Yoshi uses is the multiplication property of equality, so the correct option is B.
The step that Yoshi did is:
(1/2)*s = 112
s = 112*(2/1) = 224.
What Yoshi does there is multiplicating both sides by the inverse of (1/2), so it is cancelled in the left side and the variable is isolated.
What he is using there is "Multiplication property of the equality".
Then that is what he should have written, the correct option is B.
If you want to learn more about multiplication:
https://brainly.com/question/10873737
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