The molar heat capacity of a certain substance varies with temperature according to the given equation, \[C=27.2+(4\times {{10}^{-3}})T.\] The heat necessary to change the temperature of 2 mol. of the substance from 300K to 700K is

• A. \[3.46\times {{10}^{4}}J\]
• B. \[2.33\times {{10}^{3}}J\]
• C. \[12\times {{10}^{5}}\]
• D. \[2.33\times {{10}^{4}}J\]