EIN2 is localized to:
Correct option is C, ER membrane. In Ethylene problems like this, the accurate statement is ER membrane; the others are common mix-ups. Not these: A) Nucleus; B) Cytosol; D) Chloroplast. Tissue transport questions usually turn on xylem vs phloem, living vs dead cells, or source vs sink.
Ref: Best CSIR NET Plant Physiology books: Master Unit 6 with Taiz & Zeiger and Salisbury & Ross. Crack Part C experimental questions with top textbooks.