Answer:
C. (9,1)
Step-by-step explanation:
Let the coordinated of Jaydas House be:
A(x_1, y_1) = (1,5)
The coordinates of Christian's House be:
B( x_2, y_2)
Let the restaurant be
M(x_M, y_M) = (7,2)
The ratio is 3:1
So
m=3 and n=1
So by the formula of finding the point that divides lines into given ratios

Therefore the coordinates of Christian's house are (9,1)
Option C is correct ..