How Does Mercury's Rotation Relate to the Sun

Multiple Choice

How does Mercury's rotation relate to the Sun?

A) It always keeps one face tidally locked toward the Sun, as our Moon does with us.
B) Its year is much shorter, only 88 days, than its slow rotation of 243 days on its axis.
C) Its rotation rate is 2/3 as long as its year, due to tidal resonances.
D) Its day is the same length as its year.
E) It does not spin at all, being tidal stopped by the solar tides.