Migrating European starlings can eat many times their weight in crop-d

I choose the correct option but is it a weaken question???

The question here talks about the points where the argument fail....so the argument just said that starling cannot be used to protect crops but if starling are combined with insects they may help in a major crop harvest to protect them against insects...so the argument here fails to combine that starlings + birds can help a major growing harvest by protecting them from insects


+1 Kudos if that helps

Please some one help me understand this one better.

if i have understood the argument correctly;

A)Allow for the possibility that other migratory birds might be equally effective in reducing the population of crop-damaging insects: I am not very sure about this one but I rejected this on grounds that this brings in an external factor i.e. other migratory birds.
B)Relate to the fact that some synthetic pesticides are much more effective than others: out of scope; issue is between pesticides and birds, not between pesticides and pesticides.
C)Consider the possibility of combining both of the pest-control methods under discussion: lets say there are crops that grow within this 30 days time, may not be precisely as per the birds' migration but +/- a few days. if we combine this method with the pesticides, it might equally work.
D)Consider that there might be minor crops that do mature in less than 30 days: there might be minor crops that mature in less thn 30 days, but how many of these types of crops are there?? does the farmer grow all crops of these types?? a few crops of these types?? and many more questions liike these; hence incorrect.
E)Identify any alternative method of pest control in place of the method it rejects: he has already identified an alternative method to this, i.e. using pesticides. hence, incorrect.

hope, i could help out. a kudos would be appreciated!!!

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