Option C: $\dfrac{1}{4}$
Total outcomes = 36. Numbers less than 4 are 1, 2, 3. Favourable outcomes = 3 × 3 = 9. P = $\dfrac{9}{36} = \dfrac{1}{4}$.
When two dice are rolled, total outcomes = 6 × 6 = 36. "Less than 4" means from {1, 2, 3} — 3 choices per die. Favourable pairs = 3 × 3 = 9. Many students mistakenly include 4; remember "less than 4" excludes 4 itself.