If a Market Basket Was Defined in 2014 and It

If a market basket was defined in 2014 and it cost $10,000 to purchase the items in that basket in 2014, while it cost $12,000 to purchase those identical goods in 2015, then the price index for the base year is

A) 100.
B) (10000/12000) *100=83.33.
C) (12000/10000) *100=120.
D) unknown given this data.