$1.$ Although were capable of understanding speech at rates up to $600$ words per minute, the average person speaks much more slowly between $\_\_\_\_\_$ and $\_\_\_\_\_$ words per minute.

$\mathrm{a:\; 1}50$; $200$

$\mathrm{b:\; 1}00$; $140$

$\mathrm{c:\; 2}50$; $300$

$\mathrm{d:\; 3}50$; $400$