The ________ share of retail shares doubled last year to __%.

• A. The E-commerce share of retail shares doubled last year to 12%.
• B. The Online share of retail shares doubled last year to 16%.
• C. The E-commerce share of retail shares doubled last year to 20%.
• D. The E-commerce share of retail shares doubled last year to 16%.

Answer: (D)

Doubling a share to a given percentage means that last year’s value was half of that final percentage. If the final share is 16%, then last year it was 8%. The statement uses a precise term for the market it’s talking about: e-commerce is the standard wording for buying/selling online, so referring to the share as the e-commerce share of retail activity sounds natural and specific.

That makes the option with e-commerce and 16% the best fit: it reads smoothly and aligns with how such data is typically described. The other options either use a different term (online) or propose different final percentages (12% or 20%), which would imply different prior-year values and aren’t as consistent with the phrasing and standard terminology.