Which of the following is paramagnetic with two unpaired electrons in pi bonding molecular orbitals 

${\mathrm{B}}_2 \mathrm{contains} \mathrm{two} \mathrm{unpaired} \mathrm{electrons} \mathrm{in} \mathrm{pi} \mathrm{BMO} \mathrm{whereas} {\mathrm{O}}_2 \mathrm{contains} \mathrm{two} \mathrm{unpaired} \mathrm{electron} \mathrm{in} \mathrm{pi} \mathrm{ABMO}$;

${\mathrm{B}}_2...{\mathrm{KK}}^1{\left({\mathrm{\sigma }}_{2\mathrm{s}}\right)}^2{\left({\mathrm{\sigma }}_{2\mathrm{s}}^{*}\right)}^2 {\left({\mathrm{\pi }}_{2{\mathrm{p}}_{\mathrm{x}}}^{ }\right)}^1{\left({\mathrm{\pi }}_{2{\mathrm{p}}_{\mathrm{y}}}^{ }\right)}^1$