Combining Levitate and Jump

If a character is under the effect of both the Levitate- and the Jump spell, and is located 20 feet above ground, what happens if the character wish to make a 30 feet long jump by spending the 10 feet of movement?

a) Nothing, the character cannot move horizontally while under the Levitate spell;

b) The character is moved 30 feet in the direction of the jump and ends up 20 feet above ground;

c) The character is moved 30 feet in the direction of the jump, but ends up on the ground.

How would you rule this and why?

Nothing. Levitate specifies "The target can move only by pushing or pulling against a fixed object or surface within reach, which allows it to move as if it were climbing", so it can't move at all if in midair, and cannot jump regardless, as jumping is not climbing.

Quote from Pantagruel666 >>

Nothing. Levitate specifies "The target can move only by pushing or pulling against a fixed object or surface within reach, which allows it to move as if it were climbing", so it can't move at all if in midair, and cannot jump regardless, as jumping is not climbing.

 

 
So you think the effect of the Jump spell is effectively negated, and not introducing an additional movement option that works irrespective of Levitate? Is there any ruling that is of general nature that is providing support for one spell negating the effect of another including concrete examples? Or are there examples of the opposite where a spell’s effect works even if it contradicts the effect of another spell? Such a general ruling or supportive examples from rules or Sage advice would be very helpful.

If there is nothing immobile 20ft above the ground for the creature to push off of, then they cant move. Jumping is part of "normal" movement, i.e. walking, running, etc, involved with feet on the ground. 

If there is a wall or tree or something to push off of, you could move about, probably count it as difficult terrain since youre pulling yourself along by your hands or possible pushing off in one direction. But i dont know that id allow "jumping" from that situation since i think the basic jump is also a running jump? 

The b) & c) options make no sense.  Levitate is as mentioned.  Not sure why you would have both jump and levitate.

Quote from CaptainKaru >>

So you think the effect of the Jump spell is effectively negated.

Jump does not give you a new movement type, it just means that your existing ability to jump is better. If for any reason you are unable to jump, jump has no effect.