Option 1 -> Includes Nagaland which shares border with Myanmar, not China.
Option 2 -> Includes Nagaland which shares border with Myanmar, not China.
Option 3 -> Correctly identifies Arunachal Pradesh, Sikkim, and Uttarakhand - all three share borders with China (Tibet).
Option 4 -> Includes Nagaland which shares border with Myanmar, not China.
Hence, Option 3: (A), (B) and (C) only -> Arunachal Pradesh, Sikkim, and Uttarakhand all share international borders with China along the Himalayan region. Nagaland is located in the northeastern part of India and shares its international border with Myanmar, not China. The five Indian states/UTs that share borders with China are: Ladakh, Himachal Pradesh, Uttarakhand, Sikkim, and Arunachal Pradesh -> correct