Fick's Law of Diffusion in Lungs Steps:

• Recall Fick's law: diffusion rate = (surface area × concentration gradient) / membrane thickness.
• Identify factors: increasing surface area (W) boosts rate; decreasing thickness (Y) boosts rate; increasing partial pressure gradient (X) boosts rate.
• Evaluate options: A lists vague changes; B, C reorder factors incorrectly for all increases.
• Select D as it sequences Y (decrease thickness), X (increase gradient), W (increase area) to maximize rate.

Why D is correct:

• Matches Fick's law by reducing denominator (thickness) and increasing numerator (area × gradient), directly increasing oxygen diffusion.

Why the others are wrong:

• A: Vague terms don't specify diffusion factors.
• B: Wrong order (W first, then Y decrease, X gradient) mixes boosts with unclear sequence.
• C: Starts with X gradient but includes misplaced Y and W, not fully optimizing all factors.

Final answer: D