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Follow the link to read the passage, and then answer the question. The link opens in the same window.
According to the passage, what reason was attributed to the humpback whales' behavior in paragraph three?
The humpback whales were singing and it was upsetting the killer whales.
The humpback whales were thrashing water towards the seal to help the killer whales.
The killer whales were encircling the humpback whales.
The humpback whales were displaying signs of mobbing behavior.