The correct answer is: A. critical
A critical wicket is one that is lost at a crucial moment in a game, and can lead to the team’s eventual defeat. In cricket, a wicket is lost when a batsman is dismissed, either by being bowled, caught, run out, or stumped. If a team loses a wicket at a time when they are in a strong position, it can be very difficult for them to recover and win the game.
In the context of the question, Pakistan lost a critical wicket just when they seemed to be doing so well. This led to their eventual defeat, as they were unable to recover from the loss of the wicket.
The other options are not as accurate. A crucial wicket is one that is important, but not necessarily decisive. A sensitive wicket is one that is easily lost, but not necessarily important. A providential wicket is one that is lost in a way that helps the team to win the game.