Human activity on the continent of Antarctica is regulated by the Antarctic Treaty, which was signed in 1959 by 12 countries and prohibits any military activity, supports scientific research, and is giving protection to the continent's ecozone.
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Awhich was signed in 1959 by 12 countries and prohibits any military activity, supports scientific research, and is giving protection to the continent's ecozone
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Bwhich was signed in 1959 by 12 countries and prohibits any military activity, supports scientific research, and protects the continent's ecozone
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Cwhich, had being signed in 1959 by 12 countries, prohibits any military activity, supports scientific research, and protects the continent's ecozone
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Dwhich was signed in 1959 by 12 countries prohibiting any military action, and supporting scientific research and the continent`s resource protection
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Ehaving been signed in 1959 by 12 countries and prohibits any military activity, supports scientific research, and protects the continent's ecozone
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正确答案: B