A common emitter amplifier circuit, built using an npn transistor, is shown in the figure. Its dc current gain is 250, RC = 1 kΩ and VCC = 10 V. What is the minimum base current for VCE to reach saturation?

• A. 40 μA
• B. 100 μA
• C. 7 μA
• D. 10 μA