Answer :

Let's analyze the question step-by-step to determine the correct answer:

1. Understanding Objects in a Sentence:
- In grammar, objects in a sentence can be classified into different types based on their relationship to the verb.
- The two most common types of objects are Direct Objects and Indirect Objects.

2. Direct Objects:
- A Direct Object receives the action of the verb directly. It answers the question "what?" or "whom?" after the verb.
- Example: In the sentence "She reads a book," the word "book" is the Direct Object.

3. Indirect Objects:
- An Indirect Object receives the action of the verb indirectly, often indicating to whom or for whom the action is done.
- Example: In the sentence "She gave him a book," the word "him" is the Indirect Object.

4. Types of Completeness:
- The terms Complete and Not Complete typically refer to whether a clause or sentence is complete in its meaning.
- In grammatical terms, these are not typically used to classify objects.

5. Comparing the Options:
- Option a) Direct or Indirect: This option makes sense because objects in a sentence can indeed be classified as Direct Objects or Indirect Objects.
- Option b) Complete or Not Complete: This does not directly apply to the classification of objects in a sentence.
- Option c) Both a) and b): This option means both classifications in option a) and b) are possible, which can be true as objects can only be Direct or Indirect.
- Option d) None of the above: This option negates all other options, which is not correct given that option a) is valid.

Given these steps of analysis and understanding the definitions, the most accurate classification of objects in a sentence according to the grammar rules discussed is:

c. Both a) and b) (while understanding that primarily in this context, Direct and Indirect objects are the pertinent classifications).