Two alkenes (1,3-dimethyl-2-methylenecyclopentane and 1,2,3-trimethylcyclopent-1-ene) are formed by the elimination reaction of 1-bromo-1,2,5-trimethylcyclopentane with a strong base. Which of the following base would yield:

a. The highest percentage of 1,3-dimethyl-2-methylenecyclopentane?

b. The highest percentage of 1,2,3-trimethylcyclopent-1-ene?