Correct option is C
Solution:
From the graph:
As smoking intensity (cigarettes/day) increases, the probability of lung cancer increases.
However, the curve flattens as smoking increases, meaning the probability doesn't rise linearly (not a straight line).
This indicates non-linear or not directly proportional relationship.
Thus, smoking intensity is not directly proportional to probability — the increase is slower after a point.
Hence, the correct answer is (c) Smoking intensity is not directly proportional to the probability of getting lung cancer.
Trick to Remember:
In direct proportionality, the graph must be a straight line.
Here, it bends and flattens not direct proportionality!
Information Booster:
"Directly proportional" means if smoking doubles, probability should double — but here, doubling cigarettes doesn't double the risk exactly.
Risk increases but not at a fixed constant rate.
