In the following questions, few sentences are given. Choose and mark the sentence which contains no grammatical or contextual error in it. If all the sentences are grammatically and contextually incorrect, mark "All are incorrect" option as the answer choice.

The correct answer is: "He suggested that the matter should be taken up with the senior officer."

Let's analyze each sentence step-by-step to identify why the selected sentence is correct and why the other options contain errors:

1. "He suggested that the matter should be taken up with the senior officer."
• This sentence is grammatically correct and contextually meaningful. The verb suggested is appropriately followed by a that-clause in the subjunctive/modal construction ("that the matter should be taken up...").

2. "The manager told to his staff that the office will remain shut tomorrow."
• Error: The transitive verb told takes a direct object without the preposition to. It should be "told his staff", not "told to his staff". Furthermore, when reporting past speech ("The manager told..."), sequence of tenses usually requires changing will to would ("that the office would remain shut tomorrow").

3. "She is more experienced and also more older than the other candidates."
• Error: Double comparative error. Older is already a comparative form, so using more older is incorrect. It should simply be "older".

4. "Neither of the two witnesses were present at the time of the hearing."
• Error: Subject-verb agreement error. The pronoun Neither is singular and requires a singular verb. It should be "Neither of the two witnesses was present...", not "were present".

Therefore, the sentence with no grammatical or contextual error is "He suggested that the matter should be taken up with the senior officer."