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Most of Earth's surface is covered in water. The total surface area of Earth's water is $139,668,500$ square miles. What is the approximate surface area written in scientific notation?$\newline$Choices:$\newline$(A) $1.4 \times 10^9$ square miles$\newline$(B) $1.4 \times 10^8$ square miles$\newline$(C) $1.4 \times 10^{-9}$ square miles$\newline$(D) $1.4 \times 10^{-8}$ square miles