Consider that m elements are to be sorted. What is the worst case time complexity of bubble sort ?

Consider that m elements are to be sorted. What is the worst case time

1.	Consider that m elements are to be sorted. What is the worst case time complexity of bubble sort ?
A.	O(1)
B.	O(log n)
C.	O(n)
D.	O(n2)
Answer» E.