A particular firm added three new products earlier this year to increase variety for customers. Two of the products failed to reach the minimal sales quota. Which of the following is LEAST likely to have been the cause of their failure?
A) The products were priced too high.
B) The products were advertised incorrectly.
C) Competitors fought back harder than expected.
D) Product research was too extensive.
E) The product development costs were high.
Answer: D) Product research was too extensive.