Final answer:
PRMs are permitted to carry two pieces of mobility equipment free of charge on flights within the European Union, according to the regulation EC 1107/2006.
The correct answer is B) 2.
Step-by-step explanation:
The question about the number of pieces of mobility equipment that can be carried by Passengers with Reduced Mobility (PRMs) while traveling mainly concerns airline regulations and therefore can be classified under Law, particularly with reference to transport or aviation law. Airlines within the European Union are required, under the regulation EC 1107/2006 concerning the rights of disabled persons and persons with reduced mobility when travelling by air, to accommodate disabled persons or those with reduced mobility and to carry their mobility equipment free of charge.
According to this regulation, PRMs are allowed to take two pieces of mobility equipment free of charge, subject to possible limitations of space on board the aircraft, and subject to the application of relevant health and safety requirements. Therefore, the correct answer is B) 2.