Swimming is an action verb because you can do it. Fast is not an action verb it is an adjective.
I am not sure but I think the answer is the interest rate (e.g. 2% interest)
In some cases like the word vice, the negative connotation stems from a direct definition of the word(vice means wicked, but another definition is 'a substitute for' so 'vice president'). In other cases, word may be used in a culture to identify a group or individual that is portrayed negatively, thus modifying the inherent definition of the word to better portray how society thinks of the word.
The correct answer is A. yet. it's the only one that makes sense