Missing network configurations prevent calculation

Steps:

• Identify network 1 and 2 configurations for equivalent resistance.
• Apply series rule (sum resistances) and parallel rule (reciprocal sum) to each.
• Compute total R1 and R2.
• Divide R1 by R2 for ratio.

Why A is correct:

• Not enough information; configurations undefined.

Why the others are wrong:

• A: Assumes unverified 5/4 ratio without diagrams.
• B: Assumes unverified 4/5 ratio without diagrams.
• C: Assumes unverified 1/2 ratio without diagrams.
• D: Assumes unverified 2/1 ratio without diagrams.

Final answer: Not enough information.