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:Hour : Second :: Tertiary : ?

Answer: Option B

Second, minutes and hours are the three units of time - seconds is the smallest unit and hours is the third unit in succession. Similarly, 'primary' represents initial stage and 'tertiary' represents the third stage in a process.