Identify the correct example of disjunctive syllogism: A disjunctive syllogism is a logical structure in which the major premise is a disjunction ...

Identify the correct example of disjunctive syllogism:

A disjunctive syllogism is a logical structure in which the major premise is a disjunction (i.e., a statement of alternatives) and the conclusion is one of the alternatives.
The correct example of disjunctive syllogism is: 'A proposition is true or false. If it is not false, it must be true.'
q) 'A total of seven or eight students went to the party. Eight did not go.'
r) 'A proposition is true or false. If it is not true, it must be false.'
s) 'He traveled on the weekend, but not on Sunday.'
t) 'When he arrived, he would quench his thirst with juice or soda. Not having juice, he drank soda.'
u) 'He said he would go to Maracanã on Wednesday or Thursday, but he didn't go on any day.'