The elements that have similar electronic configurations generally have similar properties. An easy way to solve this question is to determine which elements have similar electronic configurations, something which can be done with the help of a periodic table.
In the periodic table of the elements, all the elements that have similar electronic configurations are placed in the same column, known as a group. Thus, all the members of a group have similar properties.
Among the given options, choice A and B refer to elements in the same period of the periodic table, while choice D refers to elements placed diagonally. Only choice C refers to elements in the same group. Lithium (Li), sodium (Na) and potassium (K) are part of group I of the periodic table and are known as alkali metals and have similar properties.
Thus, choice C is correct.
Hope this helps.