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At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga.
Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus.
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all the answers are based on the assumption that during any change in phase temperature is held constant , which is visible from graph
1-- when heat content is decreased , then its freezing because molecules come together
2-- when heat content is increased , then its melting , its like giving heat to molecules and separation among them increases
3-- at further higher temperature when heat content is reduced its condensation
4-- and when heat content is increased at higher temperature its vaporisation or sometimes steam formation (there is a minor difference )
so its C