Q Which of the following dinosaurs had the smallest total length?

Anchiornis was about 34 to 40 centimeters (13 to 16 inches) long, making it even smaller than a modern chicken.
For reference, Aquilops was approximately 60 centimeters (2 feet) long, and Compsognathus reached about 1 to 1.4 meters (3.3 to 4.6 feet) in length.