Study the following table, which shows the number of units of a product manufactured and sold by a company in five years, and answer the question.YearsNumber of units Manufactured (in thousands)Number of units Sold (in thousands)20133503202014375315201530028020164504232017420360The ratio of the total number of units sold in 2014 and 2015 to the number of units manufactured in 2017 is:

1. A
   $17:12$
2. B
   $19:14$
3. C
   $9:8$
4. D
   $14:17$