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

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 weight (x) and tail-feather length (y) in a sample of 5 wild male long-tailed finches. Here are the data:
$$\begin{array} { c c } \text { weight } ( \mathrm { g } ) & \text { tail length } ( \mathrm { mm } ) \\20.8 & 82.5 \\19.1 & 82.5 \\15.9 & 67.0 \\16.7 & 70.5 \\15.7 & 73.5\end{array}$$ Using appropriate software to perform the necessary calculations, what does the value of the slope for the least-squares regression line tells us?

A) For every 1 g change in weight, tail length increases by 0.280 mm, on average.
B) For every 1 g change in weight, tail length increases by 2.81 mm, on average.
C) For every 1g change in weight, tail length increases by 0.789 mm, on average.
D) For every 1 g change in weight, tail length increases by 25.547 mm, on average.