Concept:An antonym must be the most direct opposite of the underlined word and should fit correctly in the gap.
Explanation:The underlined word is "real".
"Real" means actually existing or true, and not imagined.
"Imaginary" means existing only in the mind or imagination.
Therefore, "imaginary" is the nearest opposite of "real".
"Practical" means realistic or useful, which is not the opposite here.
"Vague" means unclear, and "undefined" means not explained.
None of these gives the direct opposite meaning needed.
Answer:A. imaginary