Molybdenum deficiency may induce deficiency of:
Correct option is B, Nitrogen. In MINERAL Transport problems like this, the accurate statement is Nitrogen; the others are common mix-ups. Not these: A) Phosphorus; C) Potassium; D) Calcium. 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.