Which of the Following Represent Dependent Samples $\mathrm { i }$

Multiple Choice

Which of the following represent dependent samples.
i. Life spans of pairs of siblings.
ii. Life spans of randomly-selected pairs of people
iii. Life spans of pairs of mothers and daughters

A) iii
B) $\mathrm { i }$ and iii
C) i, ii, and iii
D) $i$