[单选题]
The grand unified theor(v 0slz gde,. 4 r/z2g1hxadvny (GUT) is a soug n6/nlvc8aup; 2qc7nxht-after model that would unify three of the four forces of nature. Whichu786cn2x/ vp;nanc ql force is the one it would not include?
A. gravitational
B. strong
C. weak
D. electromagnetic
