In each of the following questions, choose the option opposite in meaning to the word or phrase underlined. The trial of the former governor was stopped and...

The phrase underlined in the sentence "was declared null and void" means that something is considered to have no legal effect, value, or binding power. In other words, it is as if it never existed at all.

Let's consider the meanings of the options to find the one with the opposite meaning:

1. Invalid: Similar to null and void as it also means lacking legal force or not valid.

2. Nugatory: Means of no value or importance, essentially similar in essence to null and void.

3. Void: Directly matches with null, again indicating that something is of no legal force or effect.

4. Credible: Implies something or someone being trustworthy or likely to be believed, which is opposite to lacking value or effect.

Therefore, the word opposite in meaning to null and void is credible because credible implies having validity or trustworthiness, whereas null and void implies having no legal standing or validity.