What Is the Primary Advantage of Using an Online Survey

What is the primary advantage of using an online survey to get feedback from customers of an e-business?

A) The information collected has a high degree of validity.
B) The Internet has a very high penetration (as compared with telephone) .
C) It takes less time and is less costly to get results.
D) The information collected has the highest degree of reliability.
E) The sample size is unlimited.