Here's a problem to solve: A particular peach tree produces peaches that are more resistant to disease than other peaches. What method would reproduce these exact peaches?

Among the 4 following options, which is the correct answer?

- A: use bees to pollinate the flowers
 
- B: reproduce by cross-pollination of different peach trees
 
- C: increase the diversity in the peach tree
 
- D: ensure that the peach tree reproduces asexually
 