In response to Harshavardhana's Indian mission, the Chinese Emperor Tai-sung sent three Chinese missions to Harshavardhana's court, one of which reached Harshavardhana posthumously. What is the name of the Chinese ambassador involved in the last mission, who has described in detail the events that happened immediately after Harsha's death?

• A. Wang - Hrwen - Tse
• B. hwan - tsang
• C. itsing
• D. fahan