The correct answer is: E. No error
The sentence is grammatically correct. The conjunction “and therefore” is used to join two independent clauses. The independent clauses are “Neither of the plans suits him” and “he decided not to go out yesterday.” The conjunction “and therefore” shows that the second clause is a result of the first clause.
The verb “suits” is in the third person singular present tense, which agrees with the subject “Neither of the plans.” The verb “decided” is in the past tense, which agrees with the time reference “yesterday.” The verb “go” is in the infinitive form, which is the correct form to use after the preposition “to.”
The
sentence is clear and easy to understand. It does not contain any errors in grammar, punctuation, or spelling.