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Math·Algebra·Linear functions

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A wireless phone company pays customers for trading in old smartphones. The payment $p$, in dollars, is the original retail price of a smartphone minus $135 for each year since the smartphone was released. Which equation represents this situation for a smartphone with an original retail price of $750 when it was released $t$ years ago, where $t$ is a whole number and $1\le t\le 4$?

A

$p=135-750t$

B

$p=750-135t$

C

$t=135-750p$

D

$t=750-135p$