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Math·Algebra·Linear equations in one variable

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A machine makes $8$-inch, $9$-inch, and $3$-inch parts. During a certain day, the number of $8$-inch parts that the machine makes is $5$ times the number $n$ of $9$-inch parts, and the number of $3$-inch parts is $4$. During this day, the machine makes $100$ parts total. Which equation represents this situation?

A

$8(5n)+9n+3(4)=100$

B

$8n+9n+3n=100$

C

$5n+4=100$

D

$6n+4=100$