What is the area enclosed by the curve |x| + |y| = 1?
Correct: B
The curve |x| + |y| = 1 represents a square with vertices at (1, 0), (0, 1), (-1, 0), and (0, -1). The diagonals of the square are of length 2. The area of the square is (1/2) * d1 * d2 = (1/2) * 2 * 2 = 2.