Technology has made transportation, communication, and even everyday chores a lot easier. These conveniences may simplify life, but they also reduce people's activity levels. These days, lack of exercise contributes to more than half of preventable deaths around the world. Many companies are now trying to reverse this trend by making gadgets that motivate people to exercise more. Most of these play music to make exercise less boring, but some do a lot more than that.

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Some advancements in convenience have been _________ to our health.

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A sensitive
B coincidental
C hazardous
D irrelevant