Based on the information the option that correct makes the perdition is
C. The shop will sell fewer daisies than any other type of flower
Analysis of the options
The roses had more sales than tulip hence saying they will sell equal will not suit. This makes option A unsuitable, for same reason option B is also unsuitable.
Option D is not suitable because the number of daisies sold was the least and will be expected to remain at the bottom. This same reason of number of daisies being the least makes it correct to say that daisies will remain the least sold flower