What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? If Charles were curious, then Jessica is running. If Barbara climbs a mountain, then Charles is curious. Jessica is running if and only if Barbara is climbing a mountain.
If Barbara climbs a mountain, then Jessica is running. If Jessica goes running, then Barbara is climbing a mountain. If Barbara climbs a mountain, then Jessica is running.