Which of the Following Does Not Involve Active Transport Across

Which of the following does not involve active transport across membranes?

A) the movement of mineral nutrients from the apoplast to the symplast
B) the movement of mineral nutrients from mesophyll cells into xylem cells
C) the movement of sugar from one sieve-tube element to the next
D) the movement of K+ across guard cell membranes during stomatal opening
E) the movement of mineral nutrients into cells of the root cortex