1. Preheat oven to 450°.
2. Spread sauce over crust, leaving a 1/2-inch border; top evenly with mozzarella. Place pizza directly on middle oven rack. Bake at 450° for 10 minutes or until bottom of crust is browned and cheese melts. Remove pizza from oven; blot away any liquid from cheese using a paper towel. Top pizza with prosciutto.
3. Combine oil, juice, salt, and pepper in a medium bowl. Add arugula; toss well to coat. Arrange arugula mixture over pizza. Cut pizza into 8 slices.