Correct option is A
Explanation-
Trajectory A: Steepest rise (≈3.5×) - (iv) N fertilizer use
Candidate causes: N fertilizer use (post-1950s Green Revolution)
A = iv
Trajectory B: Steady rise to ~2× - (iii) Human population
Likely candidate: Human population
B = iii
Trajectory C: Gentle rise to ~1.2× - (ii) CO₂ concentration
Likely candidate: Atmospheric CO₂
C = ii
Trajectory D: Flat line (~0), little or no increase - (i) Land area
Most likely: Land area (remains mostly constant globally)
D = i
Option a : A–iv, B–iii, C–ii, D–i
