Functions and Modules: Module Quiz 3: Questions two

Question

It says, ¨Rearrange the code to define a function that calculates the sum of all the numbers from 0 to its argument.¨

Then here are the choices:
A) res + = i
B) def sum (x):
C) return res
D) res = 0
E) for i in range(x):

I clicked all of them and every single one was wrong.

Answer 1

def sum (x):
res = 0
for i in range(x):
res + = i
return res

It sums numbers from 0 to x-1