Question

a ______ is the explosion that shows the death of a star
blackhole

giant

nebula

neutron star

protostar

star

super giant

supernova

white dwarf

Explanation:

A supernova is a powerful explosion that occurs at the end of a star's life cycle, marking the death of a massive star. Black holes, giants, nebulae, neutron stars, protostars, stars, super giants, and white dwarfs do not fit the description of an explosion showing a star's death in the same way a supernova does. A black hole is formed after a supernova in some cases, a giant is a stage of a star, a nebula is a cloud of gas and dust, a neutron star is a remnant, a protostar is a forming star, a star is the general term, a super giant is a star stage, and a white dwarf is a remnant of a smaller star.

Answer:

supernova (the option with "supernova" as the text)