Which one of the following languages was added to the Eighth Schedule

Which one of the following languages was added to the Eighth Schedule by a Constitutional Amendment in 1967 ?

Khasi
Kashmiri
Sindhi
Urdu
This question was previously asked in
UPSC CDS-2 – 2022
The Eighth Schedule of the Indian Constitution lists the official languages of the Republic of India. The 21st Constitutional Amendment Act, 1967 added Sindhi to the Eighth Schedule.
– Initially, the Eighth Schedule had 14 languages.
– Later, Sindhi was added in 1967.
– Konkani, Manipuri, and Nepali were added by the 71st Amendment Act of 1992.
– Bodo, Dogri, Maithili, and Santali were added by the 92nd Amendment Act of 2003.
As of now, there are 22 languages listed in the Eighth Schedule. The question specifically asks for the language added by a Constitutional Amendment in 1967.