Which of the following factors can influence the viewership share of a program?

The time period during which a program airs can significantly impact its viewership share because it determines the audience availability and engagement. Programs that are scheduled during prime viewing hours—typically in the evening after work or school—are likely to attract more viewers compared to those scheduled during less favorable times, such as early mornings or late at night.

Different time periods also correlate with varying audience demographics; for instance, a family-oriented show might perform better when aired after school, while a late-night talk show might thrive in a different time segment. Therefore, the time period directly influences how many viewers can watch and engage with a program, making it a crucial factor in determining its overall success and viewership metrics.

Other factors like time zone can affect viewership due to geographical differences, and marketing strategy certainly plays a role in attracting audiences, but the specific time period has the most immediate and quantifiable effect on how many people are available to watch the program. Program duration is more related to content delivery rather than when the audience is actually tuning in.