Step 1: Identify the treaty.
The 1954 Agreement on Trade and Intercourse between the Tibet Region of China and India embodied the Five Principles of Peaceful Coexistence (Panchsheel).
Step 2: Parties and date.
It was signed by India and China on 29 April 1954.
Step 3: Conclude.
\[
\boxed{\text{Panchsheel was an India–China accord (Option B).}}
\]