a) action_space Box(-1.0, 1.0, (2,), float32)

The correct option is a) cause it accurately describes the action space of the LunarLanderContinuous-v2 environment. This environment is designed for continuous action spaces, which means it allows for a range of actions rather than discrete choices. The action space is represented as a Box with limits from -1.0 to 1.0 and a shape of (2,), indicating that there are two continuous actions available.