a=[(2,4),(1,2),(3,9)]
a.sort()
print(a)

a=[(2,4),(1,2),(3,9)]
a.sort()
print(a)

A. [(1, 2), (2, 4), (3, 9)]
B. [(2,4),(1,2),(3,9)]
C. Error because tuples are immutable
D. Error, tuple has no sort attribute

Solution

D. Error, tuple has no sort attribute

Explanation

A list of tuples is a list itself. Hence items of a list can be sorted.