The correct answer is: E. No error.
The sentence is grammatically correct and conveys the intended meaning. The word “enquired” is a verb meaning to ask for information. The word “of him” is a prepositional phrase that tells us who the speaker is asking the question of. The word “whether” is a conjunction that introduces a question. The word “he would” is a verb phrase that tells us what the speaker is asking the question about. The word “accompany me to Dharmsala” is a verb phrase that tells us what the speaker wants the person to do.
The sentence could be rewritten as follows:
I asked him if he would accompany me to Dharmsala.
The sentence could also be expanded to include more information, such as the reason why the speaker is asking the question or the time and place of the trip. For example:
I asked him if he would accompany me to Dharmsala next week to visit my family.