💡 Detailed Explanation
'Bakuzen' describes something that is vague, obscure, or not clearly defined. It is often used for abstract things like thoughts, feelings, or plans. Choice 1 correctly describes the feeling of 'anxiety' as being vague and not specific. The other choices are incorrect: 2 should be 'ぼんやりと' (dimly), 3 should be '曖昧な' (ambiguous), and 4 should be '散らかっていて' (messy).