The correct answer is D. Limited.
A. Changeable is not the antonym of capacious. Capacious means large or spacious, while changeable means able or likely to change.
B. Foolish is not the antonym of capacious. Capacious means large or spacious, while foolish means lacking good sense or judgment.
C. Caring is not the antonym of capacious. Capacious means large or spacious, while caring means having or showing concern for the welfare of others.
D. Limited is the antonym of capacious. Capacious means large or spacious, while limited means restricted in amount, range, or scope.
In conclusion, the antonym of capacious is limited.