The pitch __________ expressed numerically as a fraction.

The correct choice conveys that the pitch of a roof can indeed be expressed numerically as a fraction. In the context of roofing, pitch refers to the steepness or angle of a roof. This is typically represented as a ratio, which is a fraction illustrating the vertical rise over the horizontal run. For instance, if a roof rises 4 inches for every 12 inches of horizontal run, it can be expressed numerically as the fraction 4/12, which simplifies to 1/3.

By using the term "can," it accurately indicates that there is a possible method to represent roof pitch in this fractional format, aligning with both mathematical convention and practical application in construction and inspection. This flexibility allows for easier communication of pitch among builders, inspectors, and clients. The other choices do not reflect this certainty and practicality in usage, making them less appropriate.