Chemical.
An example of Physical would be water freezing in a rock and breaking it open.
The statement for mosses growing on surface of rocks, producing pits in rocks is "chemical weathering."
A rock is a solid mass of mineral grains that have grown or become cemented together.
Chemical weathering occurs when water dissolves minerals in a rock, resulting in the formation of new compounds. This is referred to as hydrolysis.
Plant roots are a major source of chemical weathering. Acids can affect the minerals in rock as roots spread into it. Most mosses have very little resistance to drying out, and because most mosses are confined to moist, sheltered regions, some types of rocks are suited for them to live.
Despite the fact that they lack true roots, they can have an impact on the surface they grow on. Mosses and lichens can disintegrate the rock on which they grow by producing various acids. Chemical weathering refers to the process of rock breakdown and chemical modification.
Hence the correct answer is chemical weathering.
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