The following question, consist of two words each that have a certain relationship to each other, followed by four lettered pairs of words. Select the lettered pair that has the same relationship as the original pair of words: Walking : Running :: Smiling : ?

The correct answer is B. Laughing.

Walking and running are both forms of locomotion, while smiling and laughing are both forms of facial expression. Walking is a slower and more deliberate form of locomotion than running, while smiling is a more subtle and restrained form of facial expression than laughing. Both walking and smiling are generally considered to be positive and pleasant activities, while running and laughing can be either positive or negative, depending on the context.

A. Feeling is not a form of facial expression.
C. Face is the part of the body on which facial expressions are made.
D. Weeping is a form of facial expression, but it is not the opposite of smiling.