A. The company's products or services are sold in a particularly lucrative market.If the market is lucrative, so profits are expected to be huge. Conflicts with argument logic, so not correct.
B. A high percentage of Company B's projected profit is expected to be reinvested into the company to encourage further growth.Doesn't make any sense for investing attractiveness. Not correct.
C. The financial advisor who wrote the article has met with the founders of Company B several times.Doesn't make any sense for investing attractiveness too. Not correct.
D. Much of Company B's expenses are spent on wages, as their product relies on the employees skill.This option just explains why this Company B has such costs, but doesn't touch investment attractiveness. Not correct.
E. Company B is in the process of developing its flagship product, which, upon release is expected to become a huge success.Partly explains the amount of costs and points out that successful product is coming which implies that investors might be interested in that company.
As for me this is very tricky question, but I believe the answer is E.