Each sentence below has four underlined parts having words or phrases marked A,B,C And D. Identify one of the underlined parts that must be changed to make the sentence correct . The house owners forget that even "so simple a matter " "as cleaning and maintaining a lawn affects ecology and should not be neglected. "No error".
A. The house owners forget that even
B. so simple a matter
C. as cleaning and maintaining a lawn affects ecology and should not be neglected .
