Answer: Option (a) is the correct answer.
Step-by-step explanation:
When we determine alternate solutions to a problem then it means that we are increasing the number of options through which that particular problem can be solved.
Therefore, each of these solutions can be applied by critical thinking (analyse and evaluate to obtain decision or judgement) before implementation in order to check their suitability. As a result, we can obtain best solution for the problem.
Thus, we can conclude that determining alternate solutions to a problem is an important aspect of critical thinking because it means that the best solution to a problem can be implemented.