The correct option is B 66 sq m
The garden is in the shape of tapezoid.
Height of the trapezoid = 6m
Length of parallel sides = 10m and 12m
Area of trapezoid = 12× (sum of parallel sides) x height
= 12× (10+12) x 6
= 12× (22) x 6
= 66 sq m
Hence, the area of the garden = 66 sq m.