Need help with 2D unity assignment

Hey guys, Im new to Unity and i got this assignment to do, could someone help me out and explain the code to doing this ? ^^

“The level map should include one additional bonus, represented by the sprite below. When collected by the player one enemy spawner is chosen randomly and two random zombies spawned by the chosen enemy spawner are killed. After the effect of the bonus is applied, the respective GameObject should disappear from the scene.”

An assignment? Like a school assignment? Aren’t you supposed to have studied all this and be able to find the solution by yourself?

Yes, maybe you’re right but i did 3 of 4 steps and this is the last one, so i was hoping for some help with the last one
Dont think its something wrong to do if I wasnt able to solve it myself ?