A passage states: 'The M16 rifle has been the standard-issue service rifle for the US military since the 1960s, though variants have been introduced over the decades.' What can be inferred from this sentence?
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A
The M16 has undergone modifications while remaining the foundational weapon platform
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B
The M16 was replaced in the 1970s
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C
No changes have been made to the original M16 design
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D
The M16 is only used by the US Army