To solve this problem you must apply the proccedure shown below:
 1. You have that If the baseball player hits a baseball from 4 feet off the ground and the problem gives the equation 

.
 2. Keeping the information given in the problem on minde, you have that 

, so you must solve the quadratic equation: 

 3. When you solve it you obtain the following result: 
 
  The answer is the first option.
 The answer is the first option.