The correct answer is:
disjunction
Step-by-step explanation:
In geometry, a conjunction is a statement joined by "and." This is "or," so it is not a conjunction.
A negation is the opposite of a statement. This is not a negation.
A conditional is an if-then statement. This is not an if-then statement, so it is not a conditional.
A disjunction is joined by "or." This is joined by "or," so this is a disjunction.