Which one is the topic sentence? ( 1 ) The 19th-century American philosopher Henry David Thoreau was famous for saying, “ Simplify, simplify. ” ( 2 ) Unfortunately, the trend these days seems to be “ complicate, complicate ” instead. ( 3 ) Many people are working longer hours, spending more money, and getting in more debt than ever before. ( 4 ) They are also relaxing less and spending less time with family and friends. However, there is also a countertrend ― a trend toward voluntary simplicity. ( 5 ) People in the voluntary simplicity movement take various steps to make their lives both simpler and more enjoyable. ( 6 ) Some people work few hours each week. ( 7 ) Some move close to their workplace to avoid a long daily commute; they walk or ride a bike, instead. ( 8 ) Some plant a vegetable garden; this gives them fresh air, exercise, and time with their families — not to mention organic produce. ( 9 ) But all people in the voluntary simplicity movement try to cut back — to buy less; they cut up their credit cards and stop buying unnecessary items. ( 10 ) In short, the priority in the voluntary movement is to follow Thoreau’s suggestion: simplify.