Determine which expression is the correct rationalization of the denominator of
I would assume it is -5 but the answer is suppose to be B
The Question Is Here ^^
The denominator becomes -5, but you are not asked what does the denominator become. You are asked to give an expression that is EQUIVALENT to the expression which has been given, which has a rational denominator (and of course is fully simplified).
I agree it is a weird question but I don't see how adding information would make it any less weird!
I don't see what's so weird about it. The question asks the reader to write with a rational denominator. The OP has misinterpreted the question as asking what would the denominator becomes in the process of rationalising.