Which of the following is a valid scientific hypothesis ? a. suvs are ruining the climate b. desert mesas are beautiful c. offshore drilling should be illegal d. earth-like planets exist elsewhere in the universe

It is between A. and D.
B and C are opinions. Are mesas really beautiful? How do you test that? Why should offshore drilling be illegal? How does this conform to scientific testing.

You can Test A. Or at least it sounds like you can. Is the climate changing because we all have cars? Maybe. A clever person might be able to take that variable and isolate it.

Seti would argue that this is true scientifically, but what would be the test.

Pick A. But multiple choice questions are a real hazard to your marks. If called on it, I would argue the point, but not disrespectfully and certainly not in front of the class.