Select the option that can be used as a one-word substitute for the given group of words.
Outer protective layer of a tree.

Correct option is A

The correct one-word for the given group of words is (a) Bark.
Explanation:
"Bark" refers to the outermost protective layer of a tree. It serves as a barrier against environmental threats and pests. (Hindi: छाल)

Example:
The medicinal properties of this plant's bark are widely known.

Meanings of the other options:
· (b) Shrub – A small woody plant (झाड़ी)
· (c) Rind – Thick outer covering of fruit (छिलका)
· (d) Peel – Skin of fruit or vegetable (छिलका)