To solve this question, the user needs to understand the concept of dynamic data areas and storage allocation in memory.

The DATA option in this context refers to a compiler option that affects where dynamic data areas and other runtime storage are allocated in memory. The option determines whether this storage is obtained from above or below a certain memory boundary called the "line."

Now, let's go through each option and explain why it is right or wrong:

A. (a) 8MB: This option is incorrect because it specifies a specific amount of memory rather than referring to the memory "line" mentioned in the question.

B. (b) 31MB: This option is incorrect because it specifies a specific amount of memory rather than referring to the memory "line" mentioned in the question.

C. (c) 16MB: This option is correct. The memory "line" referred to in the question is typically located at the 16MB boundary in memory. Therefore, the DATA option affects whether dynamic data areas and other runtime storage are obtained from above or below this 16MB line.

D. (d) 20MB: This option is incorrect because it specifies a specific amount of memory rather than referring to the memory "line" mentioned in the question.

The Answer is: C. (c) 16MB.