Final answer:
The NFL has the greatest average attendance per event due to larger stadiums and fewer games, making each event a bigger occasion. MLB, NBA, and NHL have dedicated fan bases but often smaller venue capacities. Telephone polls on TV sports programs may not represent all football fans due to biased participation. Thus (option A) is right answer.
Step-by-step explanation:
The sports league with the greatest average attendance per event among the four major professional leagues in the US is the NFL (National Football League). The NFL enjoys significant fandom across the country and has a larger stadium capacity on average compared to the other leagues, which boosts its attendance numbers. In terms of viewership, football also often commands larger TV audiences, not just at the stadiums. Factors like the number of games per season, stadium size, and game day traditions contribute to these numbers, reflecting football's cultural prominence.
Baseball, with MLB (Major League Baseball), also has strong regional support and is known for its lengthy season with many games, which can impact the average attendance when compared to the NFL's fewer, often more event-like games.
On the other hand, basketball through the NBA (National Basketball Association) and hockey via the NHL (National Hockey League) typically have smaller venue capacities, which naturally limits how many people can attend each event. Nevertheless, these sports still boast dedicated fan bases and significant viewership figures.
As for the question about whether those who participate in a telephone poll on a sports program represent all football fans, it's unlikely. This method of polling may be biased towards those who feel strongly enough to call in, who watch the sports program at the time of the poll, and who are willing to engage in the voting process, as opposed to all football fans, who may have diverse views and ways of engagement.
Thus (option A) is right answer.