The question statement is incomplete. It says:

"Figure A and B shown to long straight wires of circular cross-section (a and b with a ..."

but the crucial part is missing:

1. the full wording of the problem,
2. the figures A and B,
3. the actual option texts for A, B, C, D.

Without these, the problem cannot be solved uniquely.

Why it cannot be solved

For magnetics/current-carrying wires, the answer depends on missing details such as:

• whether the wires carry equal current or equal current density,
• whether radii are different,
• whether magnetic field is asked inside or outside the wire,
• whether the graphs/figures A and B represent field vs distance,
• what each option actually states.

Since none of this information is available, any attempt to choose an option would be guesswork.

What is needed

Please provide either:

1. the complete text of the question, and
2. the full option statements, and preferably
3. the figure/image.

Then I can solve it step-by-step using Ampere’s law / Biot–Savart law as needed.

Comparison with stored answer

The stored correct answer is given as C, but because the problem statement is incomplete, I cannot verify whether C is actually correct.