Scientific advances over the last fifty yearshave ledto revolutionary changes in health, agriculture and communication, andgenerallyenhancingsocio-economic development and the quality of ourlives.Choose the option that indicates the error in the sentence.

Answer: Option C

The sentence begins with the verb phrase “have led to”, which is followed by a series of noun phrases describing results.

For correct grammatical structure, all parts joined by “and” must maintain parallel construction.

The phrase “generally enhancing socio-economic development” breaks this parallelism because “enhancing” is a present participle, while the earlier elements are governed by “have led to”.

To maintain parallelism, it should be “and generally enhanced socio-economic development”.

Therefore, the grammatical error lies in the word “Enhancing”, making Option C the correct answer.