OK, so you know 1st person is I, Me, My so go ahead and exclude anything that is 1st person (none here).
Second person is You.
Third person is he, she, him, her, that person etc. (none here)
First person plural would be WE. (exclude any with we)
Second person plural would be you, you all.
Third person plural would be they, them, those. (exclude they)
So, that narrows it down to 2 options.
The future perfect verb tense is used for actions that will be completed before some other point in the future. Future tense describes something that happens in the future but is on going. (Here's a trick of sorts- both types are in the future but future perfect means you know it turned out <em>perfectly</em> so that means you knew what the outcome was, thus it must be over at some point)
"...will have" is an action that is in the future.
"...will have had" is a future action that will end.
Hopefully this will direct you to the correct answer.
