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If |bar(a)|=2,|bar(b)|=4,|bar( c )|=1 an...

If `|bar(a)|=2,|bar(b)|=4,|bar( c )|=1` and `bar(a)+bar(b)=-bar( c )` then `bar(a).bar(b)+bar(b).bar( c )+bar( c ).bar(a)` = ……………

A

`-9.5`

B

`-10.5`

C

`10.5`

D

`7.5`

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