【单选题】Locomotion is a slow and stupid business until you have eyes to guide you, and eyes are useless if you cannot engage in locomotion, so perception and action evolved together in an arms race.
A.
a powered railway vehicle used for pulling trains
B.
movement or the ability to move from one place to another
C.
a word or phrase, especially with regard to style or idiom
D.
a large and mainly tropical grasshopper with strong powers of flight