Although History Shows That the Odds Are Against the Success

Although history shows that the odds are against the success of any individual drug, newfound progress is an encouraging sign for a drug that many scientists regard as the most promising treatment for Alzheimer's. Rewrite, beginning with Newfound progress of a drug that many scientists regard..... The next words will be

A) is encouraging even though
B) even though it is...
C) as it encourages...
D) which also encourages...