Discussion

Explanation:

Last part of the second last paragraph states- "this led Le Boeuf to deduce that dialects were a result of isolation over time...for instance, the first settlers of Ano Nuevo could have had, by chance, calls with low pulse rates. At other sites, where scientists found faster pulse rates the opposite would have happened-seals with faster rates would have happened to arrive first”.

So if the pulse rate of the elephant seals in southern rookeries was faster, it was because the seals with faster call pulse rates might have been the original settlers (or might have arrived there first). Thus C is the best choice. 

Option (a) goes out because if that were the case, then the pulse rates of the seals in southern rookeries would have been slower, not faster. 

Option (b) also goes because here the question is migration to southern rookeries and not from southern rookeries. 

Option (d) is irrelavant to the question.

Hence, option (c).

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