When is quoting a source preferable to paraphrasing it $?$

a $.)$ ?When you want to demonstrate that you fully understand your source.

b $.)$ ?When the original text of the source is particularly complicated or dense.

c $.)$ ?When you want your writing to be as concise as possible, without any irrelevant information.

d $.)$ ?When the original text of the source is particularly remarkable or powerful.