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The two pipes are made of the same material and are connected as shown. If the cross-sectional area of BC is A and that of CD is 2A, The reactions at B and D when a force P is applied at the junction C are (                                        ). 

A.2/3P, 1/2P
B.1/3P, -2/3P
C.1/3P, 1/2P
D.-2/3P, 1/3P
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