所给答案为什么是A, 而不是B呢?The underlined word “develop” in the passag

所给答案为什么是A, 而不是B呢?The underlined word “develop” in the passage probably means “______” in Chinese.
A. 出现 B. 发展 C.导致 D. 影响
全文如下：Sitting in front of the television may be relaxing, but spending too much time in front of it may take years off your life. Watching less television may help you live a longer life.
Australian researchers collected information from more than 11,000 people over the age of 25. The study found that if people watched an average of six hours of TV a day, they lived about 4.8 years less than those who didn’t watch any television. Also, people over the age of 25 lose 22 minutes of life for each hour of TV they watch.
Most people know that sitting in front of the television isn’t healthy. The more TV you watch, the less physically active you are. And the less exercise you get, the more chances you have to develop diseases and heart problems.
The study came out in the British Journal of Sports Medicine. Lennert Veerman is the main author of the study. He thinks that the habit of sitting and watching TV long periods of time can lower life expectancy .But Veerman says watching too much TV will lower life expectancy even when people have a good diet.
Veerman says it might be useful for doctors to start asking their patients about how much time they spend in front of the TV. This may be a better way to treat patients than just asking them to get more exercise or have a healthy diet.
Veerman thinks people who care about their health can simply turn off the TV and get off the couch to get some exercise.“Exercise is good ,”he says. “Even light physical activity improves health.”