'The readings in a field book are: (FIGURE)It is subsequently realised that the distances

"The
readings in a field book are:
(FIGURE)
It is
subsequently realised that the distances to `C`
and `D`
had been
interchanged by mistake. The area of the actual field would be
(a) 1300
sq. m (b) 1500 sq. m (c) 1800 sq. m (d) 2000 sq. m"

distances