Which of the following structures is the smallest

You didn't give options sooo

If we refer to smallest structures to volume occupyingentities in nature, then the smallest known will have to be mesons (quark and anti-quark pair, like the pion $pi$), whose volume and shape is still a matter of research, but you can take an upper bound to be of order of the size of the nucleus of Hydrogen (a proton): $10^{-12}$ cm.

Explanation:

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answer is b

  a   having low self-esteem

  b   having abusive family members

  c   having poor school attendance

  d   having friends who discuss gang life

living torture and being abused makes one not mind harming other people.

and also not being supported and abusing one turns one into this state.