10 Units or C on ed
EG and FH are diagonals of the rhombus and the bisect each other at the centre to for a righ angle triangle with the side of the rhombus as the hypothenus.
By pythagoras theorem, length = \sqrt{ 8^{2} + 6^{2} } = \sqrt{64+36} = \sqrt{100} =
10 \ units
