【单选题】

The author mentions the transfer of momentum and energy in order to indicate that
A．(A) eddies, and not just jet streams, modify the distribution of temperature and kinetic energy within the atmosphere

B．(B) the relationship between baroclinic waves and the jet stream that produces them is decidedly reciprocal
C．(C) the process of secondary atmospheric circulation has a pronounced effect on the location and movement of the jet stream
D．(D) eddies play as great a role in dictating fluctuations in global temperatures as do the jet stream
E．(E) the meridional temperature gradient between the equator and poles produces a very diverse variety of atmospheric phenomenon