Identify the erroneous segment; choose ‘‘No error’’ if the sentence is correct. Sentence: Due to certain inevitable circumstances the scheduled programme had to be postponed indefinite but the members could not be informed.

Introduction / Context:
The sentence tests adjective vs. adverb form. After a passive verb phrase ‘‘had to be postponed,’’ we need an adverb to modify the manner or extent of postponement: ‘‘indefinitely,’’ not ‘‘indefinite.’’

Given Data / Assumptions:

• Verb phrase: ‘‘had to be postponed’’ (passive).
• Word used: ‘‘indefinite’’ (adjective) following the verb.
• Intended meaning: the postponement has no fixed end time.

Concept / Approach:
Adjectives modify nouns; adverbs modify verbs. Here the verb ‘‘postponed’’ needs an adverb of manner/time: ‘‘indefinitely.’’

Step-by-Step Solution:
Change word class: ‘‘indefinite’’ → ‘‘indefinitely.’’Keep the rest of the clause intact.Correct version: ‘‘… had to be postponed indefinitely …’’

Verification / Alternative check:
Substitute another adverb: ‘‘postponed temporarily/permanently’’—both are adverbs following the passive verb.

Why Other Options Are Wrong:
A, B, and D are grammatically fine; the clear form error is in C.

Common Pitfalls:
Forgetting to convert adjectives to ‘‘-ly’’ adverbs after verbs; overusing ‘‘due to’’—‘‘because of’’ is often smoother, but not incorrect here.

Final Answer:
postponed indefinite