Step 1: Read for subject-verb agreement and structure
The subject is “Her acceptance of speech,” which is singular. The verb “was well received” matches in (B). So (A) and (B) are correct.
Step 2: Examine part (C)
The phrase “Eliciting thunderous applause” is a present participle used improperly—it appears to act as a verb, but there's no proper subject reference. It should have been “and elicited thunderous applause” or “which elicited applause.”
Step 3: Check part (D)
“At several points” is a proper prepositional phrase and correctly placed.
For any natural number $k$, let $a_k = 3^k$. The smallest natural number $m$ for which \[ (a_1)^1 \times (a_2)^2 \times \dots \times (a_{20})^{20} \;<\; a_{21} \times a_{22} \times \dots \times a_{20+m} \] is: