Answer:
Area of triangle ABC = 10
Option C is correct.
Step-by-step explanation:
We need to find area of triangle ABC
We are given A(2,1) B(4,7) and C(6,3)
The formula used to find
ABC is:
In the given triangle base= AC and height = BC
First we need to find the distance between A and C and B and C
The formula used to find distance between AC 
We have 
Putting values and finding distance

find distance between BC 
We have 
Putting values and finding distance

So, We have height =
and base = 
Finding area of triangle

So, Area of triangle ABC = 10
Option C is correct.