Tail-Feather Length in Birds Is Sometimes a Sexually Dimorphic Trait

Multiple Choice

Tail-feather length in birds is sometimes a sexually dimorphic trait. That is, the trait differs substantially for males and for females. Researchers studied the relationship between tail-feather length (measuring the R1 central tail feather) and weight in a sample of 20 male and 21 female long-tailed finches raised in an aviary.
We would like to use the observed least-squares regression line between weight and tail-feather length of females to predict the tail-feather length of a male long-tailed finch weighing 8 g. Would this prediction be appropriate?

A) Yes, because the corresponding relationship is clearly linear
B) No, because the observed relationship is different for males and for females
C) No, because it would be extrapolating beyond range
D) No, because there is too much variation in the observed relationship