Count each letter in the word &quot;CLASSROOM&quot;.<br><br>&bull; C-L-A-S-S-R-O-O-M<br>&bull; Count: 1-C, 2-L, 3-A, 4-S, 5-S, 6-R, 7-O, 8-O, 9-M<br><br>There are 9 letters in CLASSROOM.<br><br>Final Answer: D: 9