With a magnetic field strength of 1.41 tesla, all of the protons in organic compounds will resonate over a narrow range of frequencies near 60 mhz. with a magnetic field strength of 7.04 tesla is employed, all of the protons in organic compounds will resonate over a range of frequencies near

Explanation:

A resonance is obtained when oscillating frequency of magnetic field becomes approximately equal to intrinsic frequency of particles in the nuclei

this method is used in Nuclear Magnetic Resonance or NMR

here the resonant frequency is directly proportional to the strength of magnetic field

from the question,

   initial Magnetic Field = 1.41 Tesla

   Initial resonant frequency = 60 MHz

   final Magnetic Field = 7.04 Tesla

   final resonant frequency =

double the distance = divide strength by 4

i am pretty sure it is c because when people are closer together, they cannot move as freely. picture being in a mostly full elevator, for instance. the people are right next to you, and you can barely move.