you were tasked to check if the liquid sample you have is substance or a mixture.which among these tests is the BEST way to do so?

I.COLOR COMPARISON
II.TASTE COMPARISON
III.BOILING POINT TEST
IV.MELTING POINT TEST


A. 1,2,3,4
B. 1,2,3 ONLY
C.1,2,4 ONLY
D.1 AND 3 ONLY