The following sentence has been split into four segments. Identify the segment that contains a grammatical error.
Bikanervala is a restaurant / chain in India / that is now famous / all ahead the world.

Correct option is A

Option (a) contains an error.
The segment "all ahead the world" uses incorrect prepositional phrasing to express global recognition or fame. The correct phrase should be "all over the world," which is a standard expression used to indicate something is known or spread worldwide.
Grammatical rule used: Correct use of prepositions in phrases that are idiomatic and fixed in usage. The phrase "all over the world" is an idiomatic expression indicating widespread occurrence or recognition.
Example: The musician's songs are loved all over the world.