A student is attempting to simplify the expression given below. Sample mathematical work is shown. Which statement best applies to the sample mathematical work?

Given , I first apply the distributive property, which yields the expression 2x + y – x – xy. I can then collect like terms: since 2x – x = x, I have the expression y + x – xy as my final answer.
A.
The student failed to properly apply the distributive property.
B.
The student collected two or more terms that were not like terms.
C.
The student failed to collect all like terms.
D.
The mathematical work shown above is correct

Question

A student is attempting to simplify the expression given below. Sample mathematical work is shown. Which statement best applies to the sample mathematical work?

Given , I first apply the distributive property, which yields the expression 2x + y – x – xy. I can then collect like terms: since 2x – x = x, I have the expression y + x – xy as my final answer.
A.
The student failed to properly apply the distributive property.
B.
The student collected two or more terms that were not like terms.
C.
The student failed to collect all like terms.
D.
The mathematical work shown above is correct