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Math·Algebra·Linear functions

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A polygonal chain is a connected series of line segments whose length is defined as the sum of the lengths of the line segments it is made of. A polygonal chain with a length of 33 centimeters (cm) is extended by adding line segments that each have a length of $8-r$ cm. Which function $f$ represents the total length, in cm, of the extended polygonal chain after $x$ line segments are added?

A

$f(x)=33(8-r)+x$

B

$f(x)=8x-rx+33$

C

$f(x)=8x-r+33$

D

$f(x)=(41-r)x$