Company R’s annual profit has increased by

问题：

Company R’s annual profit has increased by a constant amount each calendar year since 1985. What was Company R’s annual profit in 1991 ？（）
(1)In 1985 Company R’s annual profit was $212.000; in 1989 Company R’s annual profit was $242,000.
(2)Company R’s annual profit has increased by $7,500 each year since 1985.

A.条件（1）充分，但条件（2）不充分.

B.条件（2）充分，但条件（1）不充分.

C.条件（1）和（2）单独都不充分，但条件（1）和条件（2）联合起来充分.

D.条件（1）充分，条件（2）也充分.

E.条件（1）和条件（2）单独都不充分，条件（1）和条件（2）联合起来也不充分.