How many water molecules are there in one drop of water $($Volume $= 0.0018 \ mL)$ at room temperature?
- A$4.86 \times 10^{17}$
- B$6.023 \times 10^{24}$
- C$2.584 \times 10^{19}$
- D$6.023 \times 10^{19}$
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