Which statement is true about this argument? premises: if an angle measure is greater than 90°, then the angle is an obtuse angle. the measure of ∠c∠c is 102°. conclusion: ∠c∠c is an obtuse angle.
a. the argument is valid by the law of syllogism.
b. the argument is not valid because the premises are not true.
c. the argument is not valid because the conclusion does not follow from the premises.
d. the argument is valid by the law of detachment.