In order to choose a noun that does not belong to the group, we must understand what nouns are.
Nouns are naming words. For example: 'Ram is a boy.' Here, both 'Ram' and 'boy' are nouns. 'Ram' is a proper noun and 'boy' is a common noun. There are different types of nouns; i.e.; proper nouns, common nouns, material nouns, abstract nouns, concrete nouns, countable nouns, uncountable nouns, compound nouns and collective nouns.
Options B, C and D are all material nouns, whereas option A is an abstract noun.
Option B - Ink is a material noun. Hence, option B is incorrect.
Option C - Wood is a material noun. Hence, option C is incorrect.
Option D - Stone is a material noun. Hence, option D is incorrect.
Option A - Beauty is an abstract noun as we can't see or touch it. Hence, it doesn't belong to the group. Thus option A is the correct answer.