Anticline and syncline forms as a result of compressional stress. Thus, the correct option is A.
Folds known as anticlines occur when formerly horizontal strata have been folded upward and the two limbs deviate from the surface.
When rocks deform in a ductile way, they may bend or fold, and the resulting structures are known as folds, rather than shattering to produce faults or joints. Folds are caused by compressional or shear pressures operating over a long period of time. Such folds originate from rocks that we often consider brittle behaving ductilely when the strain rate is low and/or the temperature is high.
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