Question

power up challenge
prime numbers are whole numbers that can only be divided by one and themselves. prime numbers that differ by two are known as twins. twin primes such as three and five are easy to find, but they become increasingly difficult to find as numbers get bigger. computer programmers created software designed to assist mathematicians in their search. in 2016, a website that allows users to work together found two new twin primes. these numbers were then confirmed by mathematicians. each of these new numbers contains 388,342 digits. scientists suspect there may be an infinite number of twin primes, so the search for more continues.
the
process is complex.
legal
publication
identification
petition

Explanation:

The text is about finding twin primes, and the blank is in the context of the process of finding these primes. "Identification" refers to recognizing or finding something, which fits the process of finding twin primes (especially as they get bigger and harder to find). "Legal" is about law, "publication" is about publishing, and "petition" is about a request, none of which fit the context of finding prime numbers.

Answer:

C. identification