Student or Learner
My parents will be going to the United Kingdom to attend my brotherís graduation ______ January.
Choose one answer.
I am confused about in and by
In a month.
On a date.
At a time.
By would mean that it will happen before that date. It actually would work grammatically, but it's not the expected answer.
I'm not a teacher, but I write for a living. Please don't ask me about 2nd conditionals, but I'm a safe bet for what reads well in (American) English.