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Is B the correct answer?

no. its not,
write the electronic config.

1s2 2s2 2p6 3s2 3p6 3d5 4s2

the complete electronic configuration

is this correct?

absolutely. correct. gd!

now how many unpaired electrons are there

can you explain how to know how many unpaired electrons there are?

5 orbitals?

any difficulty.?

I think I understand now. but how do you know which rule to use to find half-filled orbitals?

Ok!!! Thanks a lot!

so there are 5 half filled orbitals in a manganese atom?

yes
there are 5