Answer:
C. We do not need a solution right away, since two days is plenty of time to solve this global issue.
Step-by-step explanation:
Verbal irony is saying something you don't actually mean.
The speaker is certain that they will be able to solve whatever they need to solve because it is, obviously, a minor problem. That is why the speaker is referring to it as "this global issue" to show his/her ironical attitude to the subject of discussion in the third statement.
(You're also missing a few more answers to this entire question)