Final answer:
Karan's main responsibility as an assignment editor is to determine which news stories are most important and need to be covered, ensuring that the newsroom focuses on the most impactful and relevant stories.
Step-by-step explanation:
Karan's key responsibility as an assignment editor will most likely involve determining the priority of news stories that need coverage. An assignment editor is crucial in a news company's operations, as they are responsible for coordinating news coverage by evaluating the importance of each story and deciding on which journalists or reporters should cover them. This role is essential for ensuring that the newsroom operates efficiently and that the most relevant and impactful stories are delivered to the audience.