Answer:
a
Step-by-step explanation:
Consider the triangles to be similar, that is the the one on the left and the outer one. Then the ratios of corresponding sides are equal, that is
[tex]\frac{40}{72}[/tex] = [tex]\frac{15}{d}[/tex] ( cross- multiply )
40d = 1080 ( divide both sides by 40 )
d = 27 ft → a
