The relationship between "macaroni" and "pasta" is that macaroni is a specific type of pasta. To find a pair with the same relationship, we need to look for a specific type of something in the options given.
- A tree is a type of plant, so "tree" and "plant" have the same relationship as "macaroni" and "pasta".
- B hay is not a type of vegetable.
- C pecan is a type of nut, which is similar, but the focus here is on the relationship to a broader category.
- D lemon is a type of fruit, which again is similar but not the exact relationship.
So, the best answer is A tree plant.