I certainly

(a) appreciate him

(b) telling

(c) us about the delay in delivering

(d ) the materials because we had planned to begin work tomorrow.

Detailed Explanation

I certainly

(a) appreciate him

(b) telling

(c) us about the delay in delivering

(d) the materials because we had planned to begin work tomorrow.

Explanation:

The given sentence is: "I certainly (a) appreciate him (b) telling (c) us about the delay in delivering (d) the materials because we had planned to begin work tomorrow."

Grammatical Analysis:

Let's break down each part of the sentence to understand the grammar and structure:

1. Subject and Verb Agreement: The phrase "I certainly" is the subject along with the auxiliary verb, indicating a personal action.

3. Verb Complements: "Appreciate" is a verb that needs an object to fulfill its meaning.

5. Gerund vs. Infinitive: After verbs of perception, like "appreciate," the object is followed by a gerund (verb+ing) or an infinitive (to+verb). In this case, 'telling' is correctly used as a gerund.

7. Objective Pronouns: The object 'him' acts as the receiver of the action in this sentence.

9. Possessive Adjective: According to grammatical rules outlined by high-authority linguistic sources like Grammarly, a possessive adjective should precede a gerund to show who is performing the action. For example, "I appreciate his telling us..." is correct.

Incorrect Options Analysis:

Let's analyze where the potential errors could be:

• (a) "appreciate him": This is incorrect because, following the verb "appreciate," a possessive form is needed before the gerund. Therefore, it should be "appreciate his".

• (b) "telling": This is correct as it is the gerund form of the verb "tell" and serves as a noun in this context, indicating the action of telling.

• (c) "us about the delay in delivering": This is correct as it provides additional information about what is being told.

• (d) "the materials because we had planned to begin work tomorrow": This is correct as it details the reason for the importance of the information.

Conclusion

Therefore, the error lies in option (a), which should be corrected to "appreciate his telling us about the delay in delivering the materials because we had planned to begin work tomorrow."

Hence, the correct answer is: 'a'.