Which sentence contains an element of bias?

According to researchers, children who watch less television are more likely to lead an active lifestyle and participate in sports.
Reliable research and a handful of well-regarded studies show that watching too much television can negatively impact children’s academic progress and development.
Researchers report that violent television can have a negative impact on children, but they likely aren’t taking into account the available programs that are enriching.
Children in the United States watch an average of three to four hours of television each day, according to reliable studies.

Question

Which sentence contains an element of bias?

According to researchers, children who watch less television are more likely to lead an active lifestyle and participate in sports.
Reliable research and a handful of well-regarded studies show that watching too much television can negatively impact children’s academic progress and development.
Researchers report that violent television can have a negative impact on children, but they likely aren’t taking into account the available programs that are enriching.
Children in the United States watch an average of three to four hours of television each day, according to reliable studies.

Gdeinward · Answer

What do you think? I can eliminate A.