what is a possible number of real roots for a cubic function?

Question

0,1,2,3,4

Answer 1

only 1, or exactly three.

the range of any cubic is all Reals, and the graph can have up to two turns.

one turn can occur in the region above the x axis, for example, and not go down far enough to cross x axis twice on the way back up.

Answer 2

No more than 3. There can be 3 real roots, or one real with 2 complex roots. The question is worded poorly, because as worded, there are 2 answers among the choices, since both 1 and 3 are valid answers (but not 2, because if there is a complex root, the complex conjugate of the complex root must also be a root).