C.
A book on mathematics
✓
D.
A book on trigonometry
✓
A.
A book on Islamic law
✓
B.
A medical encyclopedia
✓
C.
A book on mathematics
✓
A.
A book on healing and medicine
✓
B.
A book on Quranic sciences
✓
D.
A book on Islamic ethics
✓
B.
Ibn Qayyim al-Jawziyyah
✓
A.
A book on physical ailments
✓
B.
A book on the diseases of the heart (spiritual ailments)
✓
D.
A book on psychology
✓
