Narrowed down the choices between B and D.
As per the argument, a diet high in protein causes insomnia but author has made a point that it is not the only cause and other alternatives do exist.
A along with others causes B
In standard weaken questions, we would like to prove that either B causes A or both exists as a matter of coincidence or some other cause led to B.
In option B, we have the same format as a standard weakener but isn't it already given that there does exists alternate causes?
While
...
As per the argument, a diet high in protein causes insomnia but author has made a point that it is not the only cause and other alternatives do exist.
A along with others causes B
In standard weaken questions, we would like to prove that either B causes A or both exists as a matter of coincidence or some other cause led to B.
In option B, we have the same format as a standard weakener but isn't it already given that there does exists alternate causes?
While
...
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