Questão 96554

In formal and academic writing, precision in pronoun agreement is paramount. When 'either' is used as a pronoun, it is grammatically singular. However, in colloquial speech, this rule is often relaxed, leading to potential confusion in high-stakes examinations. Choose the alternative that completes the following sentence with the grammatically correct verb form according to formal standards: 'The two chief engineers proposed different solutions for the structural failure, but the board of directors has not yet approved either of them, as is deemed sufficiently cost-effective.'