The speed at which the current travels, in conductor, is nearly equal to

• A.  \[3\times {{10}^{4}}m/s\]
• B. \[3\times {{10}^{5}}m/s\]
• C. \[4\times {{10}^{6}}m/s\]  
• D.  \[3\times {{10}^{8}}m/s\]