_ $$\eqalign{ & {\text{If }}a + \frac{1}{b} = 1{\text{ and}} \cr & b + \frac{1}{c} = 1{\text{, then}} \cr & c + \frac{1}{a}{\text{ is equal to = ?}} \cr} $$$?

• A. 0
• B. 1/2
• C. 1
• D. 2