Polymer trapping mechanism involves synthesis of:
Raffinose and stachyose (C) is correct here. This is core PHLOEM TRANSLOCATION: once you know the definition or pathway step, Raffinose and stachyose is the clear fit. The wrong ones are A) Glucose; B) Starch; D) Cellulose. If the topic is about gradients or potentials, water/solutes move from higher to lower of the relevant quantity.
Ref: Best CSIR NET Plant Physiology books: Master Unit 6 with Taiz & Zeiger and Salisbury & Ross. Crack Part C experimental questions with top textbooks.