/sci/ - Science & Math

What is the correct answer for the possible ml values? I'm having such a hard time with this electron orbitals shit. First they tell us the rule for assigning l numbers is that they range from 0 to n-1, but that's fucking wrong because certain orbitals, s orbitals for example, can only have l=0. If I answered l=2 in the problem in the pic it would be wrong even though n=3, so for the rule "0 through n-1" 1 and 2 should be possible answers, but they're not.
Then for the ml values the rule we were told in class is that ml can be -l through l including zero. But when I first answered 0 for how many possible ml values can there be for an electron in the 3s orbitals (WHICH IS L=0 LIKE IT SAYS RIGHT FUCKING THERE) it was incorrect. My answer of 5 in the pic was just a random answer I tried second.

tl;dr how the fuck many possible ml values can there be for an electron in the 3s orbital and why?