Explanation:
Roughly one out of every thousand stars that form is massive enough to become a black hole. Therefore, our galaxy must harbor some 100 million stellar-mass black holes. Most of these are invisible to us, and only about a dozen have been identified. The nearest one is some 1,600 lightyears from Earth.
Answer:
A career assessment.
Explanation: A career assessment is a great way to find out what you wish to do with your life while the other choices provided are knowledge tests.