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Photodiode resistance drops when light strikes the diode, so more current flows and Answer C. is the right one.
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If If(max) = 40mA and V = 5V - 1.9V = 3.1V, then according to Ohms Law:
V = I x R
so:
R = V / I
R = 3.1V / 0.04A
R = 77Ω
Answer C. is the right answer.
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Answer A. is right because General Registers can contain, inter alia, address pointers.
Answer A. is wrong because the ALU - Arithmetic Logic Unit is used for arithmetic
Answer B. is wrong because General Registers are not used for arithemtic.
Answer C. is wrong because the Control Unit synchronizes the internal components of a microprocessro but does not perform arithmetic operations.
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The IC - Integrated Circuit is a FLip-Flop because when the input Dn goes High the corresponding output Q-Bar goes Low and flipping back and forth from High to Low and Low to High is what Flip-Flops are meant to do.
The Dn input stands for the nth Data input, so it's a D-Type Flip-Flop and this means the right answer is A.
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