Briefly explain four causes for students to drop out from university

Stress, Low Budget, Social Issues, and Moving to another country.

Explanation:

some teachers tend to give a lot of students large amounts of assignments, and they're expected to complete them by the next day or week. It can be overwhelming.

People with low budgets while in university may not be able to afford the prices of classes so they drop out and don't get a degree.

Sometimes people deal with bullying and exploting, so they feel like they should drop out to escape Social traps.

If your Moving to another country or state while in college, you might have to come back to get your degree. If you can't then people would drop out and attend another university somewhere else.

i would say b probably

c. taught scientists many new things about the earth, but not other planets.

explanation: