Which of these groups of crops require nursery for their successful cultivation?

A. rice, maize, pepper and okra
B. cassava, guinea corn, tomato and cowpea
C. tomato, orange, soya bean and rice
D. cocoa, orange, tomato and oil palm
E. yam, mango, cassava and pineapple

Correct Answer: Option D

D. cocoa, orange, tomato and oil palm