A System of Four Capacitors Is Connected Across A $90 - \mathrm { V }$

Multiple Choice

A system of four capacitors is connected across a $90 - \mathrm { V }$ voltage source as shown in the figure. What is the equivalent capacitance of this system?

A) $15 \mu \mathrm { F }$
B) $3.3 \mu \mathrm { F }$
C) $1.5 \mu \mathrm { F }$
D) $3.6 \mu \mathrm { F }$