Final answer:
In Python, multi-line strings are surrounded by triple quotes, which is option A) ''' '''. Options B, C, and D are incorrect for multi-line strings.
Step-by-step explanation:
To surround a multi-line string in a Python code cell, you can use triple quotes. The correct option from those listed is A) ''' '''. Neither option B) " " nor D) { } can be used for this purpose as double quotes are for single-line strings and curly brackets are used for sets or dictionaries. Option C) ( ) can be used to wrap a line for continuation but does not encapsulate strings. With triple quotes, you can create a string that spans several lines and includes line breaks in the string itself.