We would like you to assess the QUALITY of each of the following argument (discussing Gay Marriage) and determine if the argument is Valid or Invalid. A valid argument is clearly interpretable and either expresses an argument, or a premise or a conclusion that can be used in an argument for the topic of gay marriage. An invalid argument is a phrase that cannot be interpreted as an argument or not on the topic of gay marriage.

[Q]: Quite frankly, one absolute certainty in science regarding homosexuality is that being gay IS NOT a "choice".
[A]: Valid


[Q]: And it is really sad that people like him complain about being called things like "bigot" and claim that there is no evidence for such things, and then go and say disgusting things like what you just quoted.
[A]: Invalid


[Q]: Gay people sometimes do get married to opposite-sex spouses, often because they are struggling with their sexual orientation and are trying, through marriage, to make themselves heterosexual.
[A]:
Valid