Quick will mark the most brainliest pleeaaassseee

The total surface area of a regular pyramid is the sum of the areas of its lateral faces and its base.
The area of the faces = four times the area of the triangle
                                   = 4 * ( 0.5 * height * base )
                                   = 4 * ( 0.5 * 16 * 19 ) = 608
The area of the base = area of a square
                                  = 16 * 16 = 256

So, the total area = 608 + 256 = 864 units²

So, the correct answer is option A