HE IS FORTY-FIVE YEARS OLD, BUT TOM, HIS SON, IS ONLY FIFTEEN.A. H...

17. He is forty-five years old, but Tom, his son, is only fifteen.

a. He is as old as his son.

b. He is three times old as his son.

c. He is three times as old as his son.

d. His son is younger than him three times.

 c