In the question below, three statements are given which may or may not contain an error in any part of the sentence. Identify the statements containing an error and also point out the part containing the error.

I) Teams must (A)/ go door to (B)/ doors to (C)/ vaccinate children. (D)
II) All patients (A)/ must give its (B)/ informed consent for (C)/ participation in this trial. (D) 
III) We believe all of them (A)/ should be co-managing their money (B)/ together and certainly co-developing (C)/ their financial literacy habits together. (D)