Sentence Correction (SC) | Astronomers of the late twentieth century discovered several

Astronomers of the late twentieth century discovered several distant, planet-like objects orbiting the sun,which has led to heated debates over which of these objects are deserving the classification "planet."

a) which has led to heated debates over which of these objects are deserving

- which modifies "sun" and it is incorrect here as the sun has not led to heated debates, it is several distant planets, hence A is Out
b) leading to heated debates over which of these objects
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