Answer: Horizontal forces are responsible for anticlines and synclines.
Explanation: Anticlines and synclines are the up and down folds that usually occur together and are caused by compressional stress. Now, vertical forces point up or down, and horizontal forces point to the sides. If we are talking about compressional stress, this occurs when two or more forces are pointing to each other (in the same way that you can take a paper by the two ends and push your hands against each other).
Then the correct option is horizontal forces.
