Error in Word Forms Exercise 32.5

Directions:  Decide which  of the four underlined words  or phrases-(A),  (B),  (C),  or (D)-would not be considered correct,  and write the letter of the expression in the blank.  Then,  in the line at the end  of the  sentence, write  the  correction for the  underlined phrase. The first one is done  as an example.