English grammar — Spot the error (choose the segment that contains a grammatical error; choose ‘‘No error.’’ if the sentence is correct). Sentence: Even at the planning stage Rajesh was quite sure, that the scheme was binding to fail.

Introduction / Context:
This question tests correct idiomatic expression and punctuation around a that-clause. The phrase should be “bound to fail,” not “binding to fail.”

Given Data / Assumptions:

• “Be bound to + verb” expresses inevitability or strong likelihood.
• Placing a comma before a restrictive “that”-clause is generally incorrect.

Concept / Approach:
Identify the idiom first, then check punctuation. Only one segment is to be marked as the error; the principal, unambiguous error here is the misuse “binding to fail.”

Step-by-Step Solution:

Verification / Alternative check:
Corrected sentence: “Even at the planning stage Rajesh was quite sure that the scheme was bound to fail.” (Comma before “that” removed.)

Why Other Options Are Wrong:

• A/C are correct.
• B contains a debatable comma, but the core grammar/idiom error is clearly in D.

Common Pitfalls:
Confusing “binding” (as a noun/adjective meaning “obligatory,” “fastening”) with the idiomatic “bound to + verb.”

Final Answer:
binding to fail.