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Which of the values corresponds to a wall with the highest resistance to the pass of heat?

  1. K-Value = 0.40

  2. Q-Value = 1.25

  3. R-Value = 5.0

  4. U-Value = 0.80

The correct answer is: U-Value = 0.80

The U-Value represents the overall thermal conductivity of a material or assembly. A lower U-Value indicates higher insulating properties and, therefore, a higher resistance to the transfer of heat. In contrast, the K-Value, Q-Value, and R-Value do not directly represent the resistance to the pass of heat. Therefore, the correct answer is D.