The question below consists of a set of labelled sentences. Out of the four options given, select the most logical order of the sentences to form a coherent paragraph.

P. As an undergraduate, she was one of the first to study the structure of an organic compound.

Q. Educated at a coeducational school, Dorothy fought to be allowed to study science along with the boys.

R. She succeeded and was accepted in 1928 for the Chemistry programme at Oxford University.

S. Dorothy Crowfoot was the eldest of four sisters.