New technology in the form of computer spreadsheets has increased the productivity of accountants. This will cause ?

A. the demand curve for accountants to shift to the right, since the productivity of accountants has increased
B. firms to move up their demand curves for accountants
C. the demand curve for accountants to shift to the left, since it requires fewer accountants than it did before to do the same amount of work.
D. firms to move down their demand curves for accountants