Question

I had an invitation to the party, bit i'd arranged a trip to London.
Which came first:
A) The invitación
B) The arrangement por the trip

Answer 1

Respuesta:

A

because you needed to have the invitation before going to the party

Answer 2

Respuesta:

B) The arrangement por the trip

Explicación:

Because the trip may take more time to organize, it also says "there was", that is, he already made the plans for the trip, because if you look closely it is in the past tense