Since Its Inception in 1971, Socially Responsible Investments, or SRIs

Multiple Choice

Since its inception in 1971, socially responsible investments, or SRIs, have yielded returns to investors on par with investments in general. The assets of socially responsible funds (billions of dollars) from 1991 through 2002 is given by , , where corresponds to the beginning of 1991. ​
Find the rate at which the assets of SRIs were changing at the beginning of 2001.
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A) 4.050 billion of dollars/year
B) 3.646 billion of dollars/year
C) 1.771 billion of dollars/year
D) 2.677 billion of dollars/year