Match the materials listed in Group I with the most appropriate applications listed in Group II.

Group I	Group II
P. Iron-silicon alloy	1. Heating element
Q. GaAs	2. Ultrasonic generator
R. Nichrome	3. Transformer core
S. Quartz crystals	4. Light emitting diode

A. P-3, Q-4, R-1, S-2

B. P-2, Q-4, R-1, S-3

C. P-1, Q-3, R-4, S-2

D. P-3, Q-2, R-4, S-1

Answer: Option A