Option 1 -> (A)-(I) arduous doesn't fit with worry about rent; (B)-(II) ardent means passionate, not exhausted.
Option 2 -> (A)-(II) ardent means passionate, not worried about rent; (C)-(III) worried doesn't describe a trek.
Option 3 -> (C)-(IV) wrecked describes people, not a trek; (D)-(III) worried doesn't describe love/passion.
Option 4 -> (A)-(III) worried fits concern about rent; (B)-(IV) wrecked means exhausted after 48 hours; (C)-(I) arduous means difficult trek; (D)-(II) ardent means passionate love.
Hence, Option 4: (A)-(III), (B)-(IV), (C)-(I), (D)-(II) -> Mrs. Kapoor was "worried" about rent payment, Rahul was "wrecked" (exhausted) after long duty hours, the trek was "arduous" (difficult) making students famished, and his "ardent" (passionate) love for mountaineering got him the job -> correct