The average height of 30 students in a class was calculated as 177 cm. It has later found that the height of one of the students in the class was incorrectly written as 151 cm whereas the actual height was 106 cm. What was the actual average height of the students in the class?
Choose the correct choice from the following options:
A) 176.5 cm
B) 175.5 cm
C) 174.5 cm
D) 173.5 cm
E) 172.5 cm

Rationale: "the total height was 45 cm too much . the average height should be reduced by 45 cm / 30 = 1.5 cm the answer is b ."
Answer: B