Anil has \[\frac{\mathbf{2}}{\mathbf{3}}\] of a cake. He ate \[\frac{\mathbf{4}}{\mathbf{7}}\] of it. What part of the cake has he eaten?

• A. \[\frac{2}{7}\]
• B.  \[\frac{2}{21}\]
• C. \[\frac{5}{21}\]
• D. \[\frac{3}{5}\]
• E. None of these