Answer:
True.
Step-by-step explanation:
In a tectonic setting, when rocks fold, it indicates that the crust is behaving in a "ductile" manner. Ductile deformation refers to the ability of rocks to deform and change shape without fracturing or breaking. This typically occurs under conditions of high pressure and temperature, such as deep within the Earth's crust. When tectonic forces act on rocks, they can cause them to fold or bend, and this deformation is a characteristic of ductile behavior. In contrast, brittle behavior involves fracturing or breaking of rocks, such as in the case of faulting or the creation of fractures.