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If the horizontal rate of change of a particle (with right being positive and left being negative) is given by the function $r( t ) =-( t-3 ) ( t-6 ) -2$ between times $4 \leq t \leq 10$, at what time, $t$, will the particle be the farthest to the right?

A

$10$

B

$5$

C

$4.5$

D

$4$

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