Explanation: Comparative adjectives are used to compare differences between the two objects they modify (larger, smaller, faster, higher). They are used in sentences where two nouns are compared, in this pattern: Noun (subject) + verb + comparative adjective + than + noun (object). The comparative form of the adjective "good" is "better" so the correct sentence would be: the view from the roof (subject) is (verb) better (comparative adjective) than the one from the balcony (object).
