use bees to pollinate the flowers reproduce by cross-pollination of different peach trees increase the diversity in the peach tree ensure that the peach tree reproduces asexually
I gave my students this multiple choice question: A particular peach tree produces peaches that are more resistant to disease than other peaches. What method would reproduce these exact peaches?

Only one answer is correct among these 4 choices:
- use bees to pollinate the flowers
- reproduce by cross-pollination of different peach trees
- increase the diversity in the peach tree
- ensure that the peach tree reproduces asexually

Could you tell me which one is correct?

ensure that the peach tree reproduces asexually