\eqalign{ & 1 + \frac{1}{2} + \frac{1}{4} + \frac{1}{7} + \frac{1}{{14}} + \frac{1}{{28}} \cr & {\text{is equal to = ?}} \cr} $$

• A. 2
• B. 2.5
• C. 3
• D. 3.5