I believe it's A. That's considering the the words they used and the listing format.
First you need to know what a sentence fragment is and also what a complete subject and predict is. That should help you.
Theeee answer is feminism, saw it from another site.
Answer:
This temperature is on the order of billionths of a kelvin for black holes of stellar mass, making it essentially impossible to observe. Objects whose gravitational fields are too strong for light to escape were first considered in the 18th century by John Michell and Pierre-Simon Laplace.
Explanation:
