A is tricky.
The second bold phrase describes the solution in the previous sentence. So the second sentence is not the actual solution.
D makes more sense.
BTW, even though this is a bolded phrase question, I don't think the it is 700 level. 600-650 IMO.
Yes, absolutely correct. A is a sneaky little option which could make you fall for it, especially if you do not read the other option choices. Beware of easy A answers! Ensure that you read all the options properly.
First bold part - Existing optical lenses are not thin or flat enough to remove distortions
- a problem with current optical lenses
Second bold part - The surface of this lens is patterned with tiny metallic stripes which bend light differently as one moves away from the centre
- description of a new type of optical lens
(A) The first states a problem with existing optical lenses and the second states the solution for this problem that has been developed by scientists.
The first does state a problem with existing lenses - they are not thin and flat enough to remove distortion.
The solution developed is 'a lens that is super thin and flat'
The second bold statement doesn't 'state' the solution. It tells you 'how' the new lens has solved the problem.
The question is not difficult. But people would fall for the tricky option A especially under pressure on the test and if the argument is made a little more convoluted by adding more junk sentences in the middle.
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