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The amount of food, in grams, consumed by a goldfish each day during its lifespan of $20$ days is modeled by the equation $F( t ) ={ -0.1 }t^{ 2 }+2t+20$.

During which day will the fish consume the most grams of food?

A

$30$

B

$21$

C

$20$

D

$10$

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