(C) The correct answer is $C$. Protoplasmic streaming theory suggests that the translocation of food materials in two directions (bidirectional) occur

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(C) The correct answer is $C$. Protoplasmic streaming theory suggests that the translocation of food materials in two directions (bidirectional) occurs due to the streaming movement of the protoplasm within the sieve tube elements. This movement allows for the simultaneous transport of solutes to different parts of the plant.