Let a, b, c.................be factors of numbers 28. The value of \[\frac{1}{a}+\frac{1}{b}+\frac{1}{c}+.........\]is equal to

• A. \[\frac{13}{7}\]                         
• B. \[\frac{14}{7}\]
• C. \[a\frac{27}{13}\]                                 
• D.  None of these