The test question is a very simple one, and the answer should not be complicated by specious linguistic analysis, which will only distract you from the important lesson embodied in the test question. The question is very well posed to evoke exactly such analysis.
Your task is to comprehend the text; the purpose of the test is to determine whether you have comprehended it after careful reading. This is not a "trick" question, but it is designed to test your comprehension.
The text describes three kinds of identity crime, one of which is identity theft. Nowhere does it tell us how many types of identity theft there are. If the statement in question were:
There are three main kinds of identity crime.
...then the correct answer would be "true".
The most important thing to understand is that your task is to reason only from the provided text. SinceBecause we know nothing about how many types of identity theft there are, the conclusion:
There are three main kinds of identity theft.
...is false.