Kristy Ingram carries a Smartphone with her because______.A．it keeps track of her progress

Kristy Ingram carries a Smartphone with her because______.

A．it keeps track of her progress in doing exercises

B．it makes her look fashionable when doing exercises

C．it provides analytics about apps" functionality and use

D．it shares her information with third-party companies

请帮忙给出正确答案和分析，谢谢！