Answer:
There is no mistake in the solution. (Option A)
Step-by-step explanation:
The first step is correct because the divisor is reversed and the operation changed to multiplication.
The second step is also correct because 4x + 4 was correctly factored into 4(x + 1).
Then, the third step is also correct wherein (x + 1) was canceled out because it is a common factor on both numerator and denominator. Then, 6/12 was simplified to 1/2, and y/y² was simplified to 1/y.
Lastly, 1/2 times 1/y is 1/2y.