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Which one of the expressions below is the simplest form of
`frac{6(p+3r)+p}{4(2r+p)-r}`

A.`frac{7p+3r}{p+7r}`

B.`frac{4p+qr}{3r+2p}`

C.`frac{12p+18r}{4r+4p}`

D.`frac{7p+18r}{4p+7r}`