Match List I (Phenomena) with List II (Causes) and select the correct answer:
List I
A. Shock wave
B. Flow separation
C. Capillary rise
D. Cavitation
List II
1. Surface tension
2. Vapour pressure
3. Compressibility
4. Adverse pressure gradient
A B C D
a. 3 1 2 4
b. 4 2 1 3
c. 3 4 1 2
d. 4 1 2 3