Step 1: Break the definition into its parts.
The definition talks about designing and maintaining an environment, individuals working together in groups, and efficiently accomplishing selected aims.
Step 2: Recall the standard meaning of management.
Management is commonly defined as the process of getting things done through and with people working in organised groups, so that goals are achieved effectively and efficiently.
Step 3: Compare with the other terms given.
Planning only deals with deciding what to do in advance, organising only deals with arranging resources, and coordination only deals with linking activities together, none of them cover the full idea of maintaining an environment for group efficiency.
Step 4: Conclude.
Since the definition covers environment building, group effort and efficient goal achievement all together, it describes management as a whole.
Final answer: Option 1, Management.