The second choice is correct.
The correct answer is not A. Im sorry to say this but the correct answer is B. por la puerta de embarque (which will by by the gate). If you use the A option there would be a grammatical mistake putting the word "por" before something that makes no sense. Im a native spanish speaker and a teacher so believe the better way to say is por la puerta de embarque
rompeo
entiendo
cumpleron
Did you makea sandwhich yesterday
last night i read a magazine
Last saturday, my friends and i went on an outing
ayer juan comeo tacos
ayer me proffesor hablo espanol (make sure u put an accent on the n)
b
estudie accent
asistemos
fue
llege accent mark
entrege
conocí a lebron james en cleveland