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You may choose any of these five points to be ground.
Most people would choose the minus terminal of the end battery to be ground, but you don't have to.
Your circuit, and the use you put it to, may have some bearing on the choice of ground.
EDIT: it just occurred to me - there is a sixth option of have no point designated as ground. The choice is entirely yours. You are the designer of your circuit.
If you need a +/- split supply, then you would designate the center as being ground. Note that "ground" is not an absolute concept. You can call anything as ground, and then all other voltages are referenced or measured against this point.
like kripacharya said, gnd is arbitrary. it depends on what your reference is. Refer to the stack made by wp100 and then if you connect a voltmeter with negative pin at center and positive pin at top you will get +2.4V, with the positive pin at the bottom you will get -2.4V. Now if you connect the voltmeter across the top and bottom you will get 2.4 - (-2.4) = 4.8V.
You may think ground same way in real life,
for example youı are building an apartment,
you may choose the entry level as a ground floor
but you may also have some floors under the ground,
it is about potential, so you choose two point
one as a referance means zero potential,
and the other one is which you want to measure,
if second point is higher than the referance it means positive potential,
if lower it means negative potential,
in according to your potential needs you may choose referance in middle,
like if you want parking area under the ground, you need negative potential.
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