Concept:Use series and parallel capacitance rules to reduce the network to one equivalent capacitor.Explanation:The top and bottom capacitors, each of value C, are in parallel.Their equivalent capacitance is C+C=2C.The two middle capacitors are in series, so their equivalent is C+CC×C=2C.The two equivalent branches are in parallel with each other.Thus, total equivalent capacitance is 2C+2C=25C.Answer:A. 25C