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Math·Algebra·Linear inequalities in one or two variables

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A study established that in a certain park, there are at least $141$ squirrels, consisting of red squirrels and gray squirrels. The study also established that there are at least $4$ times as many gray squirrels as red squirrels in this park. Which of the following systems of inequalities best represents this situation, where $g$ is the number of gray squirrels in this park and $r$ is the number of red squirrels in this park?

A

$g+r\le 141$ $g\ge 4r$

B

$g+r\le 141$ $g\le 4r$

C

$g+r\ge 141$ $g\ge 4r$

D

$g+r\ge 141$ $g\le 4r$