Some parts of a sentence have been jumbled up, and labelled P, Q, R and S. Select the option that gives the correct sequence in which these parts can be rearranged to form a meaningful and grammatically sentence.

Dogs have been bred for __________ used to herding sheep.

P. purposes ranging from

Q. hunting to companionship, and from

R. centuries, for a variety of

S. pulling sleds to therapy work,