Final answer:
The correct answer is a) Paris and Madrid.
Step-by-step explanation:
The correct answer is a) Paris and Madrid. The World Anti-Doping Agency (WADA) has several accredited laboratories located worldwide, including Europe. Two of these labs are situated in Paris, France, and Madrid, Spain. These labs play a critical role in the testing and analysis of athletes' samples to detect the use of prohibited substances in sports competitions.