Which of the following represents the correct time-temperature curve when a block of metal is heated above room temperature & then left to cool in the room following Newton's law of cooling in which the rate of temperature drop will go on decreasing with the passage of time.

• A. <img src="/_files/images/chemical-engineering/chemical-engineering-basics/769-951-1.png">
• B. <img src="/_files/images/chemical-engineering/chemical-engineering-basics/769-951-2.png">
• C. <img src="/_files/images/chemical-engineering/chemical-engineering-basics/769-951-3.png">
• D. <img src="/_files/images/chemical-engineering/chemical-engineering-basics/769-951-4.png">