Which of the following are true when milk changes into curd?
(i) Its state is changed from liquid to semi-solid.
(ii) It changes colour.
(iii) It changes taste.
(iv) The change cannot be reversed.
Choose the correct option.
a) (i) and (ii)
b) (ii) and (iii)
c) (i), (iii) and (iv)
d) (i) to (iv)