English grammar – Spot the error (choose the part with an error or “No error”). Inversion pattern: No sooner did / the chairman begin speaking / some participants started / shouting slogans.

Introduction / Context:
The correlative structure is “No sooner … than …”. After the introductory clause with inversion, “than” must immediately introduce the next clause. The sentence omits “than.”

Given Data / Assumptions:

• Segment A uses “No sooner did …” correctly with auxiliary inversion.
• Segment B keeps the main verb in base form after “did.”
• Segment C should begin with “than,” but it does not.

Concept / Approach:
Recognize the fixed correlative pair: “No sooner … than …”. The absence of “than” is an error in C, because that is the position where it should occur: “than some participants started …”.

Step-by-Step Solution:

Verification / Alternative check:

Why Other Options Are Wrong:

Common Pitfalls:

Final Answer:
some participants started