In which Amendment act Sindhi language was included as 15th regional language in the Eight Schedule ?

1st Constitutional Amendment Act, 1956

7th Constitutional Amendment Act, 1956

15th Constitutional Amendment Act, 1963

21st Constitutional Amendment Act, 1967

In which Amendment act Sindhi language was included as 15th regional l

1.	In which Amendment act Sindhi language was included as 15th regional language in the Eight Schedule ?
A.	1st Constitutional Amendment Act, 1956
B.	7th Constitutional Amendment Act, 1956
C.	15th Constitutional Amendment Act, 1963
D.	21st Constitutional Amendment Act, 1967
Answer» E.