Topic: Subject Verb Agreement,

Best Answer Explained in Below-:

The sentence "The examination and scoring system -----" requires a verb phrase that properly agrees with its subject. The phrase "examination and scoring system" is treated as a singular noun because it refers collectively to one unified system. Therefore, the correct verb form must also be singular.

Among the provided options:

A) "provide accurate results." - This is incorrect as it uses the plural verb form "provide," which does not match the singular subject.

B) "have been designated." - This is also incorrect because "have been" implies a plural subject, which does not align with the singular nature of "system."

C) "have been designed." - Similar to Option B, this is incorrect for the same reason—the verb "have been" does not agree with the singular noun.

D) "has been designed." - This is the correct choice because "has been" is the singular form that correctly matches the singular noun "system." This phrase indicates that the design of the examination and scoring system took place in the past but still has relevance to the present.

In summary, "has been designed" is grammatically correct, making Option D the only suitable choice that logically fits the structure of the sentence.