Part of the following sentence is underlined; beneath the sentence are five ways of phrasing the underlined material. Select the option that produces the best sentence. If you think the original phrasing produces a better sentence than any of the alternatives, select choice A.

Jean Piaget, a Swiss psychologist, and the first scientist that made systematic studies of how children learn.

1. Jean Piaget, a Swiss psychologist, and the first scientist that made
2. Jean Piaget was a Swiss psychologist, also the first scientist making
3. As a Swiss psychologist, it was Jean Piaget who was the first scientist making
4. Swiss psychologist Jean Piaget, the first scientist in having made
5. The Swiss psychologist Jean Piaget was the first scientist to make