The correct answer is <u>B</u>: With training, every pet can learn new tricks to please his owner.
Explanation:
The pronoun agreement represents a fact that each pronoun must agree with its antecedent. The antecedent is the word that is replaced with the pronoun. A pronoun agrees with its antecedent when they match both in number and gender.
In our example, his is an antecedent we use to avoid repeating the noun pet.
