His promotion is on the cards. A. due B. evident C. certain D. probable

The correct answer is: D. probable

The phrase “on the cards” means that something is likely to happen. In this case, it is likely that the person will be promoted.

The other options are incorrect because:

• A. due means that something is owed or expected. In this case, it is not clear that the person is owed a promotion.
• B. evident means that something is clearly visible or obvious. In this case, it is not clear that the person’s promotion is obvious.
• C. certain means that something is absolutely sure to happen. In this case, it is not certain that the person will be promoted.