If you leave school before finishing your program, which of the following is likely to happen?
you'll earn less money over your lifetime.
you'll have a lower annual salary.
you will have fewer job opportunities.
all of the above

Your question asks what would happen if you leave school early.

The reason why answer choice "All of the Above" would be the correct answer because all of the answer choices are factors if you leave school early and do not finish.

If you don't complete/finish school, you would earn less money during your lifetime. The reason why you would earn less money over your lifetime is because without finishing school, you would be getting jobs that pay "minimum-wage" or "low income", meaning that you wouldn't be making as much during your lifetime than someone that went and finished school.

If you don't finish school, you would have a lower annual salary. Low annual salary jobs are jobs that typically do not require any educational background, meaning that you can get the job without any further education. These jobs pay lower than jobs that require education.

If you don't finish school, you would have fewer job opportunities. What this means is that you could get jobs at the local fast food and things of that sort, but you can't get any other jobs that would need an education. If you get an education, you can get even more jobs and still get jobs at places like fast foods and etc. Finishing school will allow you to seek more jobs.