The following sentence has been split into segments. Identify the segment that contains a grammatical error. If you don’t find any error, mark ‘No error’ as your answer.
The players were practicing for an hour when the coach came and asked them to stop.

Correct option is A

Option (a) contains an error. The segment should use the past perfect continuous tense "had been practicing" instead of "were practicing" to correctly denote an ongoing action that was in progress before another past action interrupted it. This tense accurately reflects that the players had been engaged in practice for a continuous period before the coach's arrival.
· Grammatical rule used: When describing an action that was ongoing in the past and got interrupted by another action, the past perfect continuous tense is used.
· Example: She had been waiting at the bus stop for 30 minutes when the bus finally arrived.