In a triangle ABC, right angled at A, AB = 4, AC = 3, suppose P is a point lying outside triangle ABC, and lying the angular region formed by the rays AB and AC (such that PA intersects BC in its interior). Suppose the perpendicular distance from P to AB and AC are 7 and 8 respectively. Then the perpendicular distance from P to BC is
(A) 4
(B) 5
(C) 8
(D) not determinable using the data
