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Math·Algebra·Linear equations in one variable

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A machine makes parts of three different sizes. During a certain day, the number of parts of one size is $5$ times the number $n$ of parts of a second size, and the number of parts of the third size is $4$. During this day, the machine makes $100$ parts total. Which equation represents this situation?

A

$7(5n)+9n+4(4)=100$

B

$7n+9n+4n=100$

C

$5n+4=100$

D

$6n+4=100$