Answer
$-Flaw:\:The\:question\:is\:biased\:by\:specifying\:artificial\:sweetener\:when\:it\:might\:not\:be\:relevant\:to\:all\:respondents.\\-Rewritten\:Question:\:Which\:sweetener\:do\:you\:prefer?$
Work Step by Step
$"Which\:artificial\:sweetener\:do\:you\:prefer?"\\The\:above\:Question\:is\:biased.\:Asking\:a\:question\:such\:as\:$
$"Which\:artificial\:sweetener\:do\:you\:prefer?"\\Instead\:of\:"Which\:sweetener\:do\:you\:prefer?"$