The correct answer is: Both I and II follow.
The first statement is in the form “Some A are B.” The second statement is in the form “All C are B.” The first statement does not tell us anything about whether or not A and C are the same set, so we cannot conclude that all dedicated souls are social workers. However, the second statement does tell us that all C are B, and the first statement tells us that some A are B. This means that some A must be C, so we can conclude that some dedicated souls are social workers.
The second statement does not tell us anything about whether or not A and C are the same set, so we cannot conclude that all social workers are dedicated souls. However, the first statement does tell us that some A are B, and the second statement tells us that all C are B. This means that some B must be A, so we can conclude that some social workers are dedicated souls.
Therefore, both conclusions I and II follow.