Mayflower Trucking Inc. incorporates and issues 1000 shares of common stock. The articles of incorporation of Mayflower Trucking grants shareholders preemptive rights. Shawn owns 100 shares of Mayflower stock. If Mayflower issues 500 more shares of common stock, Shawn has the right to purchase:
a. 10 shares.
b. 500 shares.
c. 50 shares.
d. 100 shares.