For three minutes the temperature of a feverish person has had positive first derivative and negative second derivative. Which of the following is correct?
(a) The temperature rose in the last minute more than it rose in the minute before.

(b) The temperature rose in the last minute, but less than it rose in the minute before.
(c) The temperature fell in the last minute but less than it fell in the minute before.
(d) The temperature rose for two minutes but fell in the last minute.