Which method is considered the best for milking

Choose the grammatically correct sentence.

Antibiotics are useless (A)/and proprietary antiseptic gargles and lozenges (B)/if used in access are (C)/likely to further aggravate the throat (D).

We need to have appetite for change, and the courage for change, and we need the census to do so.

He was not allowed(A)/ for the teacher(B)/ to read in a low voice.(C)

(A) The muffled sound of / (B) hooves on sand approached / (C) the opening among two wagons / (D) No error

The plan was to go for (A)/ the cinema but (B)/ owing to certain hindrances, it failed (C)/ No Error (D) 

Did you knew that the radio is ranked number two in the list of ‘101’ Gadgets that changed the World’s according to History Channel?

Each of the girls(A)/ have come(B)/ with her books.(C)

Identify the segment that contains a grammatical error. If there is no error, select 'No error'.