The correct option is A 1
In fig. (X), one of the dots lies in the region common to the circle and the square only, another dot lies in the region common to all the three figures - the circle, the square and the triangle and the third dot lies in the circle alone. In fig. (2) there is no region common to the circle and the square only and in each of the figures (3) and (4) there are regions which lie in the circle alone. Only fig. (1) consists of all the three types of regions.