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Math·Algebra·Linear functions

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As part of a science experiment on evaporation, Ella measured the height of water in a glass over a period of time. The function $f(x)=32-0.21x$ gives the estimated height, in centimeters (cm), of the water in the glass $x$ days after the start of the experiment. Which of the following is the best interpretation of $32$ in this context?

A

The estimated height, in cm, of the water at the start of the experiment

B

The estimated height, in cm, of the water at the end of the experiment

C

The estimated change in the height, in cm, of the water each day

D

The estimated number of days for all the water to evaporate