Why are the results of flame tests for the alkali metal ions difficult to distinguish? (Choose all the correct answers)

[answerhappygod]

Why are the results of flame tests for the alkali metal ionsdifficult to distinguish? (Choose all the correct answers)
A. Some metal ions are very toxic and not safe totest.
B. Almost everybody sees and describes colors differently.
C. Burning a wood stirrer will cause an orange flame.
D. Not all metal ions give flame colors.
E. Not placing the sample in the hottest part of the flame maygive bad results.
F. Nichrome wire will always produce a trace of orange/yellowcolor in the Bunsen flame.