Step 1: Origin and location.
Fundamental Duties are in Article 51A. The 42nd Amendment (1976) inserted 10 duties.
Step 2: Later addition.
The 86th Amendment (2002) added the 11th duty—{parent/guardian} responsibility to provide educational opportunities to children aged 6–14.
Step 3: Conclude.
\[
\boxed{\text{11 duties (Option D).}}
\]