Error spotting (irregular past participle & medium preposition): Identify the erroneous part (A/B/C) — choose D if there is no error — 'The eminent speaker's speech / was broadcasted over / all the major radio-stations. / No error.' Attend to the correct past participle 'broadcast' and idiomatic 'on the radio' usage.

Concept/Approach: Irregular verb 'broadcast'
The verb 'broadcast' has the same base, past, and past participle: broadcast (not 'broadcasted'). Also, radio is typically collocated with 'on': 'broadcast on the radio/on all major stations'.

Step-by-step correction
B: 'was broadcasted over' → 'was broadcast on' (also acceptable: 'was broadcast over all major radio stations').Corrected: 'The eminent speaker's speech was broadcast on all the major radio stations.'

Common pitfalls
Adding '-ed' to irregular participles; using prepositions loosely with media terms.

Final Answer
B — Write 'was broadcast (on) …', not 'broadcasted'.