Match each improper integral with the reason it is improper. A. The integral is improper for more than one reason. B. The integrand is unbounded at the lower limit of integration. C. The interval of integration is unbounded. D. The integrand is unbounded at the upper limit of integration. E. The integrand is unbounded within the interval of integration (not at one of the endpoints). 1. select 2. select 1 10 3. select 10 3 4. Select 1 -10 C 5. select 1 3