What do the indices mylist[1:3] represent?

The notation mylist[1:3] is a slicing operation that extracts a sublist from the list named mylist. In Python, when using a slice, the start index (1 in this case) is inclusive, while the end index (3) is exclusive. This means that the elements returned will include the element at index 1 but will stop before reaching the element at index 3.

To clarify, if mylist is, for example, ['a', 'b', 'c', 'd', 'e'], then:

• The element at index 1 is 'b'

• The element at index 2 is 'c'

Thus, mylist[1:3] would yield ['b', 'c'], which corresponds to the second and third elements of the list. This direct understanding of how slicing works in Python—specifically the inclusion of the start index and exclusion of the end index—proves that option B is correct.