Express the Earth-to-Sun distance, approximately 93 million miles with two significant figures, in 'miles' using powers of 10 notation.

• A. 9.3 × 10⁶ miles.
• B. 9.3 × 10⁷ miles.
• C. 93 × 10⁷ miles.
• D. 93 × 10⁶ miles.

Answer: (B)