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(A) although
(B) because
(C) unless
(D) but

Regular exercise is one of the most important habits for maintaining good health.
規律運動是維持身體健康最重要的習慣之一。

Many people know that physical activity helps them stay in shape, but they sometimes forget that it also improves mental well-being.
許多人知道身體活動有助於保持良好的體態，但他們有時會忘記，運動也能改善心理健康。

Doctors say that even 30 minutes of movement a day can make a big difference.
醫生表示，即使每天只活動30分鐘，也能帶來很大的改變。

It is helpful to choose activities you enjoy, __(17)__ you are more likely to keep doing them. 
選擇自己喜歡的活動是很有幫助的，_______ 這樣你更有可能持續進行這些活動。

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