Opinions that are not fact based can be understood as

Prejudice

The correct answer is Option (1) → Prejudice

Prejudices refer to pre-conceived opinions or attitudes held by members of one group towards another. The word literally means ‘pre-judgement’, that is, an opinion formed in advance of any familiarity with the subject, before considering any available evidence. A prejudiced person’s preconceived views are often based on hearsay rather than on direct evidence, and are resistant to change even in the face of new information. Prejudice may be either positive or negative. Although the word is generally used for negative pre-judgements, it can also apply to favourable pre-judgement. For example, a person may be prejudiced in favour of members of his/her own caste or group and – without any evidence – believe them to be superior to members of other castes or groups.