[单选题]
Capacitances of 10 mF arc8l 1gmke5b ;1wpwd5 nd 2;n d;naptfuyx7+ 9x/y0 mF are connected in parallel, and this pair is then connected in series with a 30-mF capacitor. What y pta;+;xdnf 9y/ nx7uis the equivalent capacitance of this arrangement?
A. $10 \; mF$
B. $15 \; mF$
C. $25 \; mF$
D. $60 \; mF$
