Nails R Us has the opportunity to expand its big box handyman stores into Outer Slobenia. The expansion into one store is risky, with a 20% chance of an excellent NPV and an 80% chance of a bad NPV. The expected NPV of this single store expansion is pretty bad, at -$10 million. However, if the single store happens to be successful, then next year, Nails R Us can invest $30 million and build several more stores with the same excellent outcome. The expected NPV of the entire project, including the initial store and the subsequent expansion if it is optimal to do so is $80 million. Which one of the following statements about the project's embedded growth option is true?

A) The exercise price on the growth option is $50 million.

B) The value of the growth option is $50 million.

C) The exercise price on the growth option is $10 million.

D) The value of the growth option is $80 million.

E) The value of the growth option is $70 million.