What make a problem researchable​

a problem is researchable only if it can be scientifically proven

Explanation:

In science, a problem can be defined as a statement, condition, difficulty or question which is investigated by using the scientific method. In the scientific method, first is required to raise a possible explanation or 'hypothesis', which is based on objective inferences. Second, from this hypothesis, it is possible to make predictions which are subsequently proved or rejected by carrying out experiments and/or empirical observations in order to finally obtain results and conclusions about the researchable question.

answer is a: las

explanation:

the reason for this answer is becouse it's a plural frase which talks more then one thing