Answer:
Option C.
Step-by-step explanation:
The given expression is

Step 1: Rewrite the given expression.

Step 2: Using distributive property we get
![[\because a(b+c)=ab+ac]](https://tex.z-dn.net/?f=%5B%5Cbecause%20a%28b%2Bc%29%3Dab%2Bac%5D)
Step 3: On multiplication, we get

Step 4: On addition, we get



In step 2, Calvin confused the multiplication and addition signs
Therefore, the correct option is C.