The figure is not visible in the prompt, so the exact interconnection of the four NOR gates cannot be read directly. Since the options/truth-table entries are also blank, the circuit cannot be reconstructed from the given text alone.

However, the stored correct answer is given as D. Without the figure, a rigorous gate-by-gate derivation is not possible.

What would normally be done

For a circuit of NOR gates, we would:

1. Write the output of each NOR gate using $Y = \overline{A + B}$
2. Substitute stage by stage through the four gates.
3. Simplify the resulting Boolean expression.
4. Construct the truth table for all input combinations.
5. Match that truth table with options A, B, C, D.

Limitation here

Because the actual gate connections and option tables are missing, the truth table cannot be independently derived from the provided information.

Comparison with stored answer

Given the missing figure and missing options, I cannot verify independently. The only available answer indicator is the stored correct answer.

Therefore, based on the provided record:

Selected answer: D