One hundred adults were interviewed in a telephone survey. Of interest was their opinions regarding the loan burdens of college students and whether the respondent had a child currently in college. Their responses are summarized in the table below:
![118_bbc26010-b6a5-4fff-920b-e27ef02c513f.png](https://secure.tutorsglobe.com/CMSImages/118_bbc26010-b6a5-4fff-920b-e27ef02c513f.png)
Which of the following are independent events?
a A and D
b B and D
c C and D