Correct option is C
The correct option is (c) Boron. Boron deficiency causes internal necrosis in mangoes and internal cork in apples, which leads to poor fruit quality and reduced yield.
(a) Potassium – Deficiency leads to yellowing of leaves and reduced fruit size.
(b) Chlorine – Deficiency can cause chlorotic leaves
(d) Sulphur – Deficiency leads to yellowing of young leaves, stunted growth, and potentially delayed maturity,
(e) Calcium – Calcium deficiency in mangoes can lead to internal disorders like spongy tissue, jelly seed, and soft nose