A wall with an area of 12 square meters is to be covered with rectangular tiles with a short side of 10 cm and a long side of 20 cm. The worker doing this job misunderstands the short side length of the tiles and covers the wall using 100 fewer tiles than needed.
Accordingly, what is the short side length of the tiles used by the worker in cm?
A) 12
B) 14
C) 15
D) 16
E) 18