Final answer:
Olivia is monitoring the recent fashions on a popular reality television show, which falls under the category of Style and entertainment. Therefore, the correct option is B. Style and entertainment.
Step-by-step explanation:
Olivia is monitoring the recent fashions on a popular reality television show, which falls under the category of Style and entertainment.
She is specifically monitoring the fluctuations in fashion trends, such as the types of clothing, accessories, or hairstyles that are popular among the cast members.
This type of fluctuation is related to personal style choices and entertainment rather than inventions/technology, lifestyle, or demographics.