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Math·Advanced Math·Nonlinear functions

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The function $f$ gives the predicted intensity of a beam, in number of photons in the beam, $x$ millimeters below the surface of a certain material. What is the best interpretation of $f(18)=700$ in this context?

A

A beam at the surface of the material has a predicted intensity of 18 photons in the beam.

B

A beam at the surface of the material has a predicted intensity of 700 photons in the beam.

C

A beam 18 millimeters below the surface of the material has a predicted intensity of 700 photons in the beam.

D

A beam 700 millimeters below the surface of the material has a predicted intensity of 1,400 photons in the beam.