Nursing action question

I need some assistance to find out if I'm on the right track with my thinking on this question.

20 minutes after the client has recieved a preop injection of atropine and versed, the client tells you he must be allergic to the meds because his mouth is dray and his heart seems to be beating faster than normal. What is your best FIRST action?

a) document the findings as the only action
b) check the client's pulse and blood pressure
c) prepare to administer epinephrine and benadryl
d) explain to the client that these symptoms are normal responses to the medication

Ok, my thinking is that yes you would want to explain to the client that these symptoms are normal responses to the meds because this would be something that they might experience, However, I would think that anytime someone is complaining of these symptoms regardless of what meds they got you would want to check thier pulse and blood pressure before doing anything else. Am I on the right track with this thinking? Or am I overthinking and you would just want to do d.

Thanks for any extra brain power on this one.