1 . 3log102+3log155=?

• A. ${\log }_{10}\left(\frac{5}{8}\right)$
• B. ${\log }_{10}\left(\frac{8}{5}\right)$
• C. ${\log }_{10}\left(\frac{2}{5}\right)$
• D. ${\log }_{10}\left(40\right)$

Answer: Option D

Explanation: