Why are measuring objectives in a community program important?
1. to determine the purpose of the program
2. to establish goals
3. to involve others to join the program
4. to monitor changes to the problem

Explanation:

Measuring objectives is measure the progress, that why "to monitor changes to the problem" is the answer.

When we are setting objectives, these need to be measurable, because monitoring is crucial. This way, we can have a particular approach to events and see if objectives are having the expected performance.