Before 1986 physicists believed they could describe the universe in terms of four universal forces. Experiments then suggested, however, a fifth universal force of mutual repulsion between particles of matter. This fifth force would explain the occurrence in the experiments of a smaller measurement of the gravitational attraction between bodies than the established theory predicted. Which one of the following, if true, most strengthens the argument that there is a fifth universal force?
A: No previously established scientific results are incompatible with the notion of a fifth universal force.
B: The extremely sophisticated equipment used for the experiments was not available to physicists before the 1970s.
C: The experiments were conducted by physicists in remote geological settings in which factors affecting the force of gravity could not be measured with any degree of precision.
D: Some scientists have suggested that the alleged fifth universal force is an aspect of gravity rather than being fundamental in itself.
Choose A, B, C or D as your solution.
A