Explanation

The second half of the sentence says that the crew became frustrated and decided to take matters into their own hands, implying that they took over the ship. Mutiny fits perfectly. (A sea change is “a profound transformation,” while a putsch is “the overthrow of a government.”)

For the first blank, you need a word implying that the captain tried to fight off the mutiny. Dissuading is something you can do only to people (i.e., “I dissuaded the pirates from mutinying.”). Warded off means “fended off” or “averted,” which is perfect here.

Warded off, mutiny.

why dissuade doesn't work?

The key for the solution is to look at the second part of the sentence, in which we do have



This means that the crew took possession of the ship, actually there was a mutiny and the captain was "wrap off".

Dissuaded is when you try to convince a person, for instance, to stay. It is exactly or almost the contrary of wrap off.

Hope this helps.

Regards

To dissuade means to persuade someone not to do something. By that deffinition, it should technically fit the sentence. I guess it doesnt fit simply because the word following it (mutiny) is not a person but simply an idea.

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