I think it is A
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Step-by-step explanation:
-1/3 a + 4 ≤ 0
3*(-1/3a) + 4*3 ≤ 0*3
-a + 12 ≤ 0
12 ≤ a
12 ⩾a
a⩾12
Given is triangle with base = 10 cm and perpendicular height = 3 cm.
We know the formula for area of triangle is given by :-
Area =
× (Base) × (perpendicular height)
Area =
× (10) × (3)
Area = 
Area = 15 cm²
So, final answer is 15 cm².