Final answer:
The average age for an American female to begin puberty is between 9 and 10 years old. If Ana's breasts are just starting to develop and she is growing pubic hair, she is likely around 9 or 10 years old.
Step-by-step explanation:
The average age for an American female to begin puberty is between 9 and 10 years old. The first visible changes are the development of breast tissue and the growth of pubic hair. These changes are followed by a growth spurt, which typically starts around ages 9 to 11 and can last for two years or more.
Based on this information, if Ana's breasts are just starting to develop and she is growing pubic hair, she is likely around 9 or 10 years old. Therefore, the correct answer is 9 (A).