To update the actual values inside a list, the program must update each value by itsindex.

The correct code is:

for i in range(len(numbers)):

numbers[i] = numbers[i] + 5

Here, range(len(numbers)) produces valid index positions for the list. The variable i is used to access and update each list element.

Example:

numbers = [10, 20, 30]

for i in range(len(numbers)):

numbers[i] = numbers[i] + 5

print(numbers)

Output:

[15, 25, 35]

Option A does not correctly update the original list:

for number in numbers:

number = number + 5

This changes only the temporary loop variable number, not the actual elements stored inside the list.

Therefore, the correct answer isB.