25 POINTS!!!!!
What is the best way to combine these sentences?

Hilda Ramirez is 65 years old, but she competed in a triathlon and she won the world championship. For her age group.

A. Hilda Ramirez is 65 years old, but she competed in a triathlon, and she won the world championship for her age group.
B. Hilda Ramirez is 65 years old. She competed in a triathlon. She won the world championship. For her age group.
C. At the age of 65, Hilda Ramirez competed in a triathlon and won the world championship for her age group.
D. At the age of 65, for her age group, Hilda Ramirez competed in a triathlon, winning the world championship.