Which of the following causes the rusting of iron? <br>a)Oxidation <br> b)Reduction <br> c)Chemical reaction with oxygen <br> d)Chemical reaction with CO

Question

$\begin{array}{1 1} \text{(a) a and b} \\ \text{(b) b and c} \\ \text{(c) c and d } \\ \text{(d) a and c} \end{array} $