Topic: Subject Verb Agreement,

Best Answer Explained in Below-:

The correct answer is A) "have worked" because it accurately uses the present perfect tense, which is suitable for describing actions that occurred at an unspecified time before the present. In this context, the reward is being announced for employees who have put in hard work in the past, without specifying when that work took place.

The present perfect tense (have/has + past participle) emphasizes the connection between past actions and their relevance to the present moment. Here, "have worked" highlights that the employees' hard work is the basis for the reward being given now.

The other options are incorrect for the following reasons:

- B) "has worked" is inappropriate because "employees" is plural and should use "have."
- C) "will be work" is grammatically flawed and does not fit the context since it suggests future actions rather than past achievements.
- D) "have had worked" is also incorrect because it uses an unnecessary construction that complicates the meaning.

Thus, "have worked" is the most fitting choice, clearly indicating appreciation for the employees' past efforts.