Symplastic movement of ions requires passage through:
That points to B: Plasmodesmata. Compared with the other options, Plasmodesmata is the one that correctly describes the MINERAL Transport concept. The wrong ones are A) Cell walls only; C) Xylem vessels; D) Intercellular spaces. If you’re stuck, eliminate anything that contradicts a basic fact you already know for this topic.
Ref: Best CSIR NET Plant Physiology books: Master Unit 6 with Taiz & Zeiger and Salisbury & Ross. Crack Part C experimental questions with top textbooks.