Which one of the following is not an aircraft ?

Jaguar
Dornier-228
Sarath (BMP-II)
MIG-27M

The correct answer is (c), Sarath (BMP-II).

Jaguar is a twin-engine, single-seat, all-weather, multirole combat aircraft. It was developed jointly by the British Aerospace and the French Dassault Aviation. The Jaguar is used by the air forces of India, Brazil, Oman, and South Africa.

Dornier-228 is a twin-engine, turboprop utility aircraft. It was developed by Dornier Flugzeugwerke of Germany. The Dornier-228 is used by airlines, air forces, and other government agencies for a variety of roles, including passenger transport, cargo transport, and military transport.

Sarath (BMP-II) is a tracked infantry fighting vehicle. It was developed by the Soviet Union. The Sarath is used by the armies of India, Sri Lanka, and Bangladesh.

MIG-27M is a single-engine, supersonic, ground-attack aircraft. It was developed by the Mikoyan-Gurevich Design Bureau of the Soviet Union. The MIG-27M is used by the air forces of Russia, India, and Iraq.

Sarath (BMP-II) is not an aircraft because it is a tracked infantry fighting vehicle. It is not a fixed-wing aircraft or a rotorcraft.