Answer:
Option 1st is correct
area of a triangle is, 80 in²
Explanation:
Area of triangle(A) is given by:

where,
b is the base
h is the height or altitude of the triangle respectively.
As per the statement:
Base of a triangle(b) = 10 inches and
Height = altitude(h) = 16 inches
Substitute these in [1] we get:

⇒
in²
Therefore, the area of a triangle is, 80 in²