در جمله زیر، کلمه beat به طور دقیق‌تر به چه معناست؟

After covering the White House beat for nearly a decade, the journalist was reassigned to the foreign policy desk.

A) A regular rhythm or pattern in a piece of music
B) A particular area of news reporting assigned to a journalist
C) A period during which a journalist is prohibited from publishing
D) An exclusive news story obtained ahead of competing reporters