And sales of children’s bicycles in Australia have plummeted in the past decade, down 28 per cent — or 110,000 bikes — since 2007

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And sales of children’s bicycles in Australia have plummeted in the past decade, down 28 per cent — or 110,000 bikes — since 2007. It’s a trend that has left health experts concerned about the ______________ of physical activity for younger generations who are missing out on daily exercise.

1. lack
2. rack
3. sack
4. pack