Which of the Following Is NOT Descriptive of "Threat of Substitute

Which of the following is NOT descriptive of "threat of substitute products or services?"

A) Substitute products appear to be different, but satisfy the same need as another product.
B) If the cost of switching is low, substitutes may have a strong effect on an industry.
C) Identifying substitutes is relatively easy since they look similar.
D) Possible substitute products or services may not appear to be easily substitutable.
E) Substitutes limit the potential returns of an industry.