Question

read this sentence from the text. \. . . so it follows that if, on examination, these new doctrines which have now been explained to us are found to be better and more effectual, let us accept them at once without any delay.\ (paragraph 4) in the sentence, effectual means the same as — effect effective effectively ineffective

Explanation:

"Effectual" is an adjective similar in meaning to "effective", which means producing a desired or intended result. "Effect" is a noun or verb, "effectively" is an adverb, and "ineffective" means not effective.

Answer:

B. effective