The distillation column shown in the drawing is used to distill a binary mixture. symbols x, y, and z denote mole frac- tions of the more volatile component, while b, d, r, and f represent molar flow rates. it is desired to control distillate composition y despite disturbances in feed flow rate f. all flow rates can be measured and manipulated with the excep- tion of f, which can only be measured. a composition ana- lyzer provides measurements of y.

Which statement explains which thermometer is more appropriate to measure the temperature of a liquid at 43.6 degrees celsius a) thermometer a, because it measures temperature more accurately than thermometer b b) thermometer b, because it measures temperature more accurately than thermometer a c) thermometer a, because it measures temperature more precisely than thermometer b d) thermometer b, because it measures temperature more precisely than thermometer a