~A triangles inner angles added equal 180
~Add all the angles
2x + 8 + 4x - 8 + 3x
~set equal to 180
2x + 8 + 4x - 8 + 3x = 180
~combine like terms
2x + 4x +3x + 8 - 8
9x = 180
x = 20
~now add 20 back into the angles
2(20) + 8 = 48
4(20) - 8 = 72
3(20) = 60
Therefore, 48 is the lowest interior angle so your answer is C.
If this helps leave a brainliest :-)