Heterobeltiosis is estimated over the

Answer: Option C

Heterobeltiosis is estimated over the Better parent.
Heterosis, or hybrid vigour, is the superiority of the hybrid for a certain trait over the mean of its two parents.
Heterobeltiosis is a form of heterosis where the hybrid is superior to its best parent. It can be calculated by,
Heterobeltiosis = $$\frac{{\text{F}}_1-\text{BP}}{100}\times \text{BP},$$    Where BP is mean of better parents.