The correct answer is: Only conclusion I follows.
The first statement is in the form “Some A are B.” The second statement is in the form “C is A.” The first statement does not tell us anything about whether or not all A are B, so we cannot conclude that C is B. However, the first statement does tell us that there is at least one A that is B, so we can conclude that there is at least one B that is A. In other words, we can conclude that some B are A.
Therefore, the only valid conclusion is conclusion I. Conclusion II is not valid, because it does not follow from the premises.