$A$ point is moving on $y=4-2x^2$. The $x$-coordinate of the point is decreasing at the rate of $5 \text{ units/s}$. Then,the rate at which the $y$-coordinate of the point is changing when the point is at $(1,2)$ is
- A$5 \text{ units/s}$
- B$10 \text{ units/s}$
- C$15 \text{ units/s}$
- D$20 \text{ units/s}$
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