What factor caused readership of The Boston Globe to plummet?

A.
poor journalism

B.
a competitor

C.
online news

D.
rising subscription costs

C. online news

The factor that caused the readership of The Boston Globe to plummet was a combination of factors, including C. online news and D. rising subscription costs. The rise of the internet and the availability of online news sources led to a shift in readership preferences, with many people opting to consume news online rather than through traditional print media. Additionally, the Boston Globe, like many other newspapers, experienced rising subscription costs, making it less affordable for many readers to continue their subscriptions. These factors, among others, contributed to the decline in readership for The Boston Globe.