In the following question, some parts of the sentence may have errors. Select the option that has the error. If the sentence has no error then select ‘No Error’.
In the ancient world, theories of the origin of Earth and the objects see in the sky were certainly much less constrained.

Correct option is A

Option (a) contains an error.
The phrase “objects see in the sky” is grammatically incorrect.
It should be: “objects seen in the sky” — the past participle "seen" must be used to form the passive structure, indicating that the objects are observed (seen) by someone.
Grammatical rule used:
In passive voice, use the past participle of the verb: be + past participle
Here, "the objects seen" is a reduced form of "the objects that are seen."
Example:
Correct: The stars seen in the sky last night were beautiful.
Incorrect: The stars see in the sky last night were beautiful.