Believing that every problem has a solution is part of this set of values a. efficiency and practicality. The definition of the set of values is a main part of the question.
ANSWER:
Believing that every problem has a solution is a part of efficiency and practicality.
EXPLANATION:
Whenever a problem is faced, it is handled with efficiency and practicality. This means that every problem is taken up to be solved. New solutions to problems are always found so that these can be solved.
A problem is taken up in a practical manner and new methods and technology are always found out so that problems can be fixed.
