Gold can undergo transmutation. Which equation could correctly describe this radioactive decay?

Superscript 185 Subscript 79 Baseline Upper A u right arrow Superscript 181 Subscript 77 Baseline Upper Re + Superscript 4 Subscript 2 Baseline Upper H e

Superscript 185 Subscript 79 Baseline Upper A u right arrow Superscript 181 Subscript 77 Baseline Upper I r + Superscript 4 Subscript 2 Baseline Upper H e

Superscript 185 Subscript 79 Baseline Upper A u right arrow Superscript 181 Subscript 77 Baseline Upper I r + Superscript 0 Subscript negative 1 Baseline e

Superscript 185 Subscript 79 Baseline Upper A u right arrow Superscript 181 Subscript 77 Baseline Upper I r + Superscript 0 Subscript positive 1 Baseline e

um B is the answer on the unit test