Context of Curb

Sixty-six years ago, there was a single human-built object in earth orbit: Sputnik, the world’s first satellite. Today, there are 100 trillion objects circling the planet. That’s the jaw-dropping number cited by international researchers in an open letter published March 9 in Science, calling for a global treaty to curb the ever-growing debris belt in low-earth orbit.
—Time

Which of the following BEST interprets the meaning of “curb” in the passage?


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