The reading of the ammeter for a silicon diode in the given circuit is:

1. 15 mA
2. 11.5 mA
3. 13.5 mA
4. 0

Silicon diode is in forward bias. Hence, potential barrier across the diode is

ΔV = 0.7 Volts

I = (V - ΔV)/R

= (3 - 0.7)/200

= 2.3/200

= 11.5 mA

The correct option is B.