Answer:
The correct option is (a)
Explanation:
In project management, constraint refers to any limitation that causes hindrances in project completion. Constraints could be in the form of time, cost, scope and resources.
Here, Galaxy construction company is facing resource constraint as it is not able to find a manufacturer of eco-friendly tiles to complete its construction project. Tiles are crucial resource to complete the project in time. Unavailability of the same will impact the project adversely.