Find the Area of Triangle ABC with the Given Parts $3 \mathrm { cans }$

Multiple Choice

Find the area of triangle ABC with the given parts. Round to the nearest tenth when necessary.
-A painter needs to cover a triangular region 63 meters by 67 meters by 71 meters. A can of paint covers 70 square meters. How many cans will be needed?

A) 14 cans
B) $3 \mathrm { cans }$
C) 315 cans
D) 28 cans