Find the error in the following sentence and replace it with the corr…

The correct answer is Option (2) → D only

No sooner ... than:

• No sooner shows that one action followed another at once.
• The pattern:
  • No sooner + auxiliary + subject + verb ("No sooner did I reach").
  • The second part always begins with than, never "when" ("when" goes with hardly or scarcely).
    Example: No sooner had the bell rung than the children ran out.

A. reach — Incorrect.

• "did I reach" is right: after "did" the base form of the verb is used.

B. Now — Incorrect.

• The fixed phrase is No sooner.
• "Now sooner" means nothing.

C. begin — Incorrect.

• The past tense began is right for an event in the past.

D. than — Correct.

• "when" is the error.
• No sooner must be followed by than.
• Correct form: No sooner did I reach London than it began to rain.

E. raining — Incorrect.

• "began to rain" is correct as it stands.

Contrast: "no sooner" pairs with than. "Hardly" and "scarcely" pair with when.

Tip: In this question the options do not follow the order of the statements (Option 1 = A only, Option 2 = D only, Option 3 = C only, Option 4 = E only). NTA often jumbles the options in this way, so after finding the correct statement, read the options carefully and mark the one with the right letter.