[单选题]
Compared to the electrostatic force, the nuclear force b3c+6fu ,0mvcq,o+pc ztlfc c.i+(wga etvn.lh 8p i hz .)4b+-kufqebr(ween adjacent protons in a nh4h.+vb.p u(8)qbz firenk l -ucleus is
A. much weaker.
B. about the same size.
C. only slightly larger.
D. much larger.
