$2$ parallel plate capacitors have the same area and separation distance.

You use equal amounts of three different dielectic materials to fill the space between the plates as shown in the diagrams.

Given: Each material has a dialectic constant greater than $1$

K$2=2$K$1$

K$3=3$K$1$

Which arrangement produces the larger capacitance value?

$($a$)$

$($b$)$