Answer:
(see explanation)
Step-by-step explanation:
Your answer would be that a transitive verb is an action verb that links the subject with the object of the sentence, which is receiving the action (see I).
In I, the transitive verb is bought. This transitive verb selects two arguments: the NP subject Mary and the NP D.O the book. Transitive verbs have these two prominent features: they act as an action verb and they use a direct object that receives the action.
I) Yesterday, Mary bought the book