Four identical capacitors are connected as shown in diagram. When a...

Four identical capacitors are connected as shown in diagram. When a battery of \( 6 \mathrm{~V} \) is connected between \( A \) and \( B \), the charge stored is found to be \( 1.5 \mu \mathrm{C} \). The value of \( C_{1} \) is
(a) \( 2.5 \mu \mathrm{F} \)
(b) \( 15 \mu \mathrm{F} \)
(c) \( 1.5 \mu \mathrm{F} \)
(d) \( 0.1 \mu \mathrm{F} \)