Which of the Following Is Likely to Endanger the Accuracy

Multiple Choice

Which of the following is likely to endanger the accuracy of a sales forecast made one year in advance?

A) A competitor's improved product makes our's technologically obsolete during that year.
B) A change in our company management resulted in changes in our strategic marketing plans during the year.
C) The consumers' buying psychology during the year fulfilled our predictions.
D) All of these contribute to inaccuracy.
E) Only two of A-B-C are likely to throw our forecast into error.