The word 'pragmatic' means dealing with things in a sensible and realistic way, based on practical considerations rather than theoretical or idealistic ones.
Synonyms for pragmatic include realistic, sensible, and logical. Options (A), (B), and (D) are all similar in meaning to pragmatic.
The opposite of being pragmatic is to be guided by ideals, principles, or a vision of how things should be, rather than how they currently are.
The word 'idealistic' perfectly captures this opposite meaning. An idealistic person is often contrasted with a pragmatic person.
Therefore, the opposite of 'pragmatic' is 'idealistic'.