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Explanation:

We have to mark the answer that cannot be inferred, as it is an EXCEPT question. 

Option (a) can be inferred because the seals exhibited dialects because the population was isolated. This isolation was a result of the seal population being almost on the verge of extinction. Since their numbers were very small, the isolation happened. As the population grew there was immigration to different places and this resulted in disappearance of the dialects. Thus we can infer A. 

Option (b) also can be inferred from the para that talks about Ano Nuevo seals. It clearly suggests that the average pulse rate increased from 1970s till the dialects disappeared. 

Option (c) is certainly a wrong inference because the influx might have resulted in pulse rate of the seals averaging to that of Isla Guadalupe, but not exceeding. The word “exceeding” makes this a wrong inference, and therefore the right answer.

Option (d) is exactly true to what the passages, as a whole, discusses. The individual call rate did not change throughout, but the immigration made all the difference, by ensuring influx of seals with higher pulse rate, thus increasing the average pulse rate.

Hence, option (c) is correct.