Of the 75 employees, there are four subsets defined by the characteristics of five years of experience (or not) and a college degree (or not):
1. both
2. neither
3. 5 years, no college degree
4. college degree, less than 5 years
We're looking for (2). Statement (1) gives us (1), which tells us that the remaining three subsets sum to 75-30=45, but doesn't allow us to find "neither." Statement (2) gives us (3), but again doesn't provide enough information to find neither.

Taken together, the statements are still insufficient. We know that 50 total employees have five years of experience, but we don't know how many of those without five years of experience do or do not have a college degree. (E) is the correct choice.