Question

To dilute an acid with water, acids are added to water and not water to acid because

Acids are more vicourse than water
Water is weaker than acid
Dissolution of acid in water is exothermic which could be explosive
Acids will not dissolve in water if done wrongly

Answer 1

Dissolution of acid in water is exothermic which could be explosive.
Explanation. For example, sulfuric acid is dissolving in water with release of big amount of heat. Evidently, this amount of heat is proportional to the quantity of acid. Thus, acid should be added to water in small portions.