Until its defeat by Ireland, the Pakistani team won most of its test matches by innings and had achieved a_ series of wins.

Explanation

Correct Answer: B. unbrokenExplanation: The sentence suggests that until its defeat by Ireland, the Pakistani team had an unbroken streak of winning most of its test matches by innings.Why other options are not correct:- A. defeated: "Defeated" is the opposite of what is suggested in the sentence.- C. difficult: "Difficult" is not fitting in the context of describing the team's wins.- D. aggressive: "Aggressive" is not fitting in the context of describing the team's wins.