Read the following passage and mark the letter A, B, C, or D to indicate the correct word or phrase that completes each of the blanks.

Today, childhood is spent mostly indoors watching television, playing video games, and (10) ____ the Internet. When children do go outside, it tends to be for scheduled events like a soccer match or a fishing derby. These events are held under the watch of adults.

The shift to an indoor childhood has accelerated in (11) ____ the past decade, with a significant decline in spontaneous outdoor activities such as bike riding, swimming, and touch football, according to separate studies by the National Sporting Goods Association. (12) ____ a child is six times more likely to play a video game on a typical day than to ride a bike.

Indoor childhood has brought about some changes which can be seen in children's bodies. In the 1960s, 4% of kids were obese. Today, 16% are overweight. The changes can also be seen in their (13) ____ . Studies indicate that children who spend plenty of time outdoors have a longer attention span than those who watch (14) ____ television and play video games.