Answer
(b) two
Work Step by Step
The grand unified theory tries to combine the strong force with electro-weak force. So, it will reduce the fundamental forces into two, the electro-strong and the gravitational forces.
College Physics (7th Edition)
by Wilson, Jerry D.; Buffa, Anthony J.; Lou, Bo
Published by
Pearson
ISBN 10:
0-32160-183-1
ISBN 13:
978-0-32160-183-4
Chapter 30 - Nuclear Reactions and Elementary Particles - Learning Path Questions and Exercises - Multiple Choice Questions - Page 1028: 22
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