A person standing on a weighing scale notices a reading of 148 pounds on the scale. This person is influenced by:

The most appropriate law to answer this question is Newton's third law. It refers to forces exerted on a body that is of equal magnitude and opposing direction.

A person standing on a weighing scale is mentioned in the question. So, according to the third law, two forces are acting on the object. Furthermore, we know that these forces are equal in magnitude and opposing in direction.