Explanation:

Correct answer is (c). Connector I There are so many reality shows in various channels with the same idea and concept that nobody knows the future of the reality shows contestants these days
This is correct since both the sentences are connected meaningfully. Connector II is not correct since it is the cause and not the effect of some event. Had it been ‘Since there are so many reality shows in various channels with the same idea and concept, nobody knows the future of the reality shows contestants these days’, it would have been correct. Connector III With so many reality shows in various channels with the same idea and concept, nobody knows the future of the reality shows contestants these days. It is correct since both the sentences are connected meaningfully. Hence, Option C is the correct choice.