Which is not one of darwin’s four main ideas of natural selection

This must be a Choice question but the choices are not there so the only thing I can do is send you the four major ones and you can pick which one is not the major one for your question hope this helps don't worry about sending points I don't work care about him

What are the four major points of Darwin's theory of natural selection?

1. Overproduction - more offspring are born than survive

2. Genetic Variation - there is variation in the population

3. Struggle to Survive - organisms with suitable variations will survive and reproduce

4. Differential Reproduction - suitable variations are passed on to offspring

Iam not sure but to me it with be a or dsorry if i was late! hope this ! : )if you really want me to find out the answer that is correct tell me and i will do more research but the a or d makes sense to me.