Correct Option (a):
Baikonur is the site of the Baikonur Cosmodrome, the world's first and largest operational space launch facility. It is located in Kazakhstan, not Russia. While constructed during the Soviet era, it became part of independent Kazakhstan after the dissolution of the USSR. Russia currently leases and operates the facility under an agreement with Kazakhstan. Therefore, the pairing Baikonur-Russia is not correctly matched.
Incorrect Options:
Kourou-French Guiana: Kourou is located in French Guiana, an overseas department and region of France in South America. It hosts the Guiana Space Centre, which is the primary spaceport for the European Space Agency (ESA). This pair is correctly matched.
Borobudur-Indonesia: Borobudur is a 9th-century Mahayana Buddhist temple complex situated in Central Java, Indonesia. It is a UNESCO World Heritage site. This pair is correctly matched.
Cannes-France: Cannes is a city on the French Riviera in France. It is internationally renowned for hosting the annual Cannes Film Festival. This pair is correctly matched.