3) C

Increase in sales: 
Increase in sale of Asquith = 300,000 – 240,000 = 60,000
Increase in sale of Burton = 420,000 – 380,000 = 40,000
Increase in sale of Coleridge = 400,000 – 350,000 = 50,000
Increase in sale of Darwin = 250,000 – 150,000 = 100,000
Increase in sale of Elgar = 630,000 – 580,000 = 50,000

Main features of the pie chart:
Darwin will have the largest proportion (100,000 is the biggest) of the pie chart. This rules out D and E.
Coleridge and Elgar will have equal proportions (both have 50,000) of the pie chart. This rules out A and B.

We are only left with C. So this is the answer.

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