A. Reduce
B. Reduction
C. Reliable
D. Relation
Background about the Question
The sentence “The problem is not ___ of tone of internal.” is grammatically incorrect and appears to contain a printing or typing mistake. Among the given options, “Reduction” is the only noun that can reasonably fit after the phrase “is not”. The other options (Reduce, Reliable, and Relation) do not fit the sentence structure or intended meaning.
In English grammar, after linking verbs such as is, was, are, and were, a noun or adjective is generally required depending on the sentence structure.
Important Key Facts about Noun Usage
- Correct Option: Reduction
- Part of Speech: Noun
- Reduce: Verb
- Reliable: Adjective
- Relation: Noun (does not fit the sentence meaning)