Answer:
A
Explanation:
took the test
fewest to most:
0.000000009 ⇒ 0.0450 ⇒ 321.598 ⇒ 1.0000001
0.000000009 = 1 sig fig
0.0450 = 3 sig figs
321.598 = 6 sig figs
1.0000001 = 7 sig figs
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