Point B is at (3,1).
For which segment is B a midpoint?
.AC¯¯¯¯¯¯¯¯ with endpoints at A(1,−1) and C(5,3)
.AD¯¯¯¯¯¯¯¯ with endpoints at A(1,−1) and C(6,4)
.AC¯¯¯¯¯¯¯¯ with endpoints at A(1,−1) and C(7,5)
.AC¯¯¯¯¯¯¯¯ with endpoints at A(1,−1) and C(8,6)