introvert(अंतर्मुखी): a shy, reticent, and typically self-centered person.
admirable(प्रशंसनीय): arousing or deserving respect and approval.
proud(गर्व): feeling deep pleasure or satisfaction as a result of one's own achievements, qualities, or possessions or those of someone with whom one is closely associated.
egoistic(अहंकारी): egotistical, egocentric, self-centered.
Hence, admirable is an appropriate word. so option b is correct.
wonderful:nice::superb:admirable -> अद्भुत: अच्छा :: शानदार: सराहनीय