Which of the following nutrients affects the plant by being colorless lent of unfolded leaves at the top leaving gelatinous material?

Correct option is D

The symptoms described, including colorless lent of unfolded leaves at the top leaving gelatinous material, are indicative of a disorder known as "tip burn" or "tip necrosis." This condition is often associated with calcium deficiency in plants.
Calcium (Ca): Calcium plays a crucial role in cell wall structure and integrity. A deficiency of calcium in plants leads to cell wall breakdown, leading to symptoms such as tip burn. This is commonly observed in younger leaves, which exhibit poor appearance and gelatinous material at the leaf tips, which are consistent with the effects of insufficient calcium.