The correct answer is: C. Either I or II is implicit
The statement “The improvement in the quality of T.V. programmes will lead to increase in the sales of T.V.” does not explicitly state that T.V. is a good entertainment medium or that the quality of T.V. programmes has improved recently. However, both of these assumptions are necessary for the statement to be true.
If T.V. is not a good entertainment medium, then people will not be motivated to buy T.V.s, even if the quality of the programmes has improved. Similarly, if the quality of T.V. programmes has not improved, then people will not be motivated to buy T.V.s, even if T.V. is a good entertainment medium.
Therefore, either assumption I or assumption II must be true in order for the statement to be true.