Q. If b>a, b>c, then area of quadrilateral formed by straight line x=a, x=b, y=c and y=d is

• (A) (b-a)(d-c)
• (B) 1/2(b-a)(d-c)
• (C) (b+a)(d+c)
• (D) 1/2(b+a)(d+c)