The argument is the first line of the paragraph where it states that ready meals should be labelled with health warnings. We must find a statement which strengthens this argument.
A – Wrong
People not knowing how to cook is irrelevant to the argument that why ready meals should come with a warning.
B – Wrong
People not having the time to cook is irrelevant to the argument that why ready meals should come with a warning.
C – Correct
Since people are unaware of the unhealthy proprieties of the ready meals, they should come with labelled warnings. So C is correct.
D – Wrong
Lack of exercise is not mentioned in the text and hence,m is irrelevant to the argument.
E – Wrong
This actually weakens the argument and states that a labelled warning would not have nay effect on people.