Prior exploration of the moon and data collected from probes sent to Mars have allowed that the National Aeronautics and Space Administration can develop a lunar outpost concept, and to plan for future manned missions to Mars. A. have allowed that the National Aeronautics and Space Administration can develop a lunar outpost concept, and to plan B. have allowed the National Aeronautics and Space Administration to develop a lunar outpost concept and to plan C. have allowed for the National Aeronautics and Space Administration to develop a lunar outpost concept, as well as planning D. has allowed the National Aeronautics and Space Administration to develop a lunar outpost concept, and they are planning E. has allowed for the National Aeronautics and Space Administration to develop a lunar outpost concept and to plan