The solubility of substance a in four different solvents at low temperature and high temperature are given below. which solvent is the best for recrystallizing substance a ?

Solubility Low T High T
a. acetone 5 g/ml 7 g/ml
b. toluene 57 g/ml 70 g/ml
c. hexane 8 g/ml 142 g/ml
d. water 112 g/ml 134 g/ml