UNEP is a. Fully responsible for implementing the Montreal Protocol and manages all the programmes aimed at implementing its provisions b. Responsible for coordinating and facilitating the implementation of the Montreal Protocol and a lot of other IGOs make a significant contribution to implementing its provisions. However States are primarily responsible for taking the measures required to meet the targets c. The only IGO responsible for coordinating and facilitating the implementation of the Montreal Protocol, and states are primarily responsible for taking the measures required to meet the targets d. Responsible for implementing the Montreal Protocol and a lot of other IGOs also make a significant contribution to implementing its provisions