Why is prior familiarity with society considered a disadvantage in learning Sociology?

It may prevent students from critically examining their common-sense assumptions.

The correct answer is Option 3: It may prevent students from critically examining their common-sense assumptions.

The knowledge people acquire through socialisation often appears natural and unquestionable. Sociology requires students to critically reassess these assumptions because they may be incomplete or biased.

NCERT: "This prior knowledge or familiarity with society is both an advantage and a disadvantage for sociology, the discipline that studies society. The advantage is that students are generally not afraid of Sociology – they feel that it can’t be a very hard subject to learn. The disadvantage is that this prior knowledge can be a problem – in order to learn Sociology, we need to “unlearn” what we already know about society. In fact, the initial stage of learning Sociology consists mainly of such unlearning. This is necessary because our prior knowledge about society – our common sense – is acquired from a particular viewpoint. This is the viewpoint of the social group and the social environment that we are socialised into. Our social context shapes our opinions, beliefs and expectations about society and social relations. These beliefs are not necessarily wrong, though they can be. The problem is that they are ‘partial’. The word partial is being used here in two different senses – incomplete (the opposite of whole), and biased (the opposite of impartial). So our ‘unlearnt’ knowledge or common sense usually allows us to see only a part of social reality; moreover, it is liable to be tilted towards the viewpoints and interests of our own social group."