In practice, the compression ratio of compression-ignition (CI) engine ranges from ______________________?

(A) 15 to 25 ()
(B) 5 to 10 (X)
(C) 40 to 55 (X)
(D) 60 to 70 (X)

Answers: In practice, the compression ratio of compression-ignition (CI) engine ranges from  15 to 25.