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Based on a model, on day $1$ of an $8$-day experiment, a lima bean plant had an estimated mass of $253$ grams, and each day after day $1$ of the experiment, the estimated mass of the plant decreased by $4$ grams. Which equation represents this model, where $m$ is the estimated mass, in grams, of the plant on day $x$ of the experiment and $1\le x\le 8$?

A

$m=-4x+245$

B

$m=-4x+249$

C

$m=-4x+253$

D

$m=-4x+257$