Clarissa invests in a locally owned bank which gives her a 10% interest rate. Her first year, she deposits $100 and by t

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Clarissa invests in a locally owned bank which gives her a 10%
interest rate.
Her first year, she deposits $100 and by the end of the year has
$110.
Her second year, she invests $110 and by the end of the year the
interest has earned a total of $121.
This is a non-biological example of a:
A. double-blind group.
B. No answer text provided.
C. Negative feedback loop
D. Positive feedback loop
E. Placebo treatment