The answer choice which is not one of the three most prevalent behaviours that successful students follow is; Always be competitive.
<h3>Prevalent behaviours of successful students</h3>
It follows that the task content that the answer choices provided represent the behaviours of students.
However, the exception to the prevalent behaviours of successful students lies in the fact that successful students don't necessarily have to be competitive, they just do their best work.
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The italicized word is <em>extremely </em>and the correct answer is intensive.
The word extremely is an adverb, which means that you can rule out <em>noun, adjective, </em>and <em>verb </em>immediately. You can also rule out <em>empty word </em>because <em>extremely </em>has a particular meaning on its own, which means that it cannot be empty. Thus, we are left with one option only - <em />intensive.