First, you convert them all so they have the same denominator.
So,
3/4= 9/12
2/3=8/12
1/2=6/12
0----1/12----2/12----3/12----4/12----5/12----6/12----7/12----8/12----9/12----10/12----11/12----1
Christopher has the most becayse 9/12 is greater than 8/12 and 6/12.
Jaden has the least.
All together, they have 9+8+6 out of 12 which = 23/12= 1 11/12 pies