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Before 1986 physicists believed they could describe
the universe in terms of four universal forces.
Experiments then suggested, however, a flfth
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) The extremely sophisticated equipment used
for the experiments was not available to
physicists before the 1970s. (
B) No previously established scientific results are
incompatible with the notion of a fifth
universal force.
(C) Some scientists have suggested that the alleged
fifth universal force is an aspect of gravity
rather than being fundamental in itself.
(D) 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.
(E) The fifth universal force was postulated at a time
in which many other exciting and productive
ideas in theoretical physics were developed,

Why is C wrong ..If the fifth force is an aspect of gravity ... wouldn't it help in the measurement of gravity ???