Option 1 -> "Tranquil" means calm and peaceful, which is the direct antonym of "hustle" (busy, noisy, chaotic).
Option 2 -> "Align" means to arrange in a straight line or bring into agreement; it's not related to the concept of hustle/bustle.
Option 3 -> "Disturbed" means agitated or troubled, which is similar to hustle/bustle rather than opposite.
Option 4 -> "Turbulent" means chaotic and unstable, which is synonymous with hustle/bustle, not an antonym.
Hence, Option 1: tranquil -> The sentence contrasts peaceful country life with the busy, noisy city life, making "tranquil" (calm, peaceful) the perfect antonym of "hustle" -> correct