Use the premises and conclusion to answer the question. premises: if a triangle has an angle with more than 90 degrees, then the triangle is an obtuse triangle. the measure of an angle in triangle abc is 110 degrees. conclusion: triangle abc is an obtuse triangle is this argument valid? why or why not? 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 valid by the law of detachment d. the argument is not valid because the premises are not true