Simple permanent tissues in plants are parenchyma, collenchyma and sclerenchyma; each has a distinct wall structure and function.

Sclerenchyma cells are dead at maturity and have thick walls heavily deposited with lignin, leaving almost no internal space. These fibres and sclereids (stone cells) make plant parts hard and stiff — the shells of nuts, the husk of coconut and the grit in pear fruit are made of them.

Collenchyma gives flexibility with some support through cellulose-pectin thickening at the corners of living cells, as in leaf stalks, but it is not hard. Parenchyma consists of thin-walled living cells used for storage and photosynthesis. Aerenchyma is parenchyma with large air spaces that gives buoyancy to aquatic plants. As one listed tissue fits, “None of the above” is not correct.

Sclerenchyma option is correct.