If I didn’t make the check point by 10am, then I wouldn’t have been able to continue hiking to the peak. I made it to the peak on foot, so I did make the checkpoint by 10am.

Select one:

The argument is invalid, the premises don’t rule out the possibility that they missed the checkpoint and found another way to the peak.

The argument is invalid, they might not have gotten to the peak for some other reason.

The argument is valid, they made it to the checkpoint.

The argument is valid, the premises are true and the conclusion is too.

The argument is invalid, if the premises were true, the conclusion would have to be too.

The argument is valid, if they missed the checkpoint then one of the two premises would have to be false.