Believing that every problem has a solution is part of which set of values?
a. efficiency and practicality
b. efficiency and progress
c. morality and practicality
d. work

a) Efficiency and practicality

Explanation: Efficiency is defined as the planning and organizing anything. Practicality describes the possibility of any event in feasible way. therefore , believing that every problem has got a solution is the efficient and practical approach.

In this approach ,it is believed that solution for every issue can be found and the work can be done by being practical. The proper planning can help to reach the aim.

Other options are incorrect because progress,morality and work is related with the betterment and ethics of doing task.Thus, the correct option is option(a).