The op. 101 first mvt is technically in sonata allegro format, although it is unusual. Tempo is “Allegretto ma non troppo”. The exposition is not repeated. Development starts measure 34, recap at measure 55, coda at about meas. 87. As much as I love this beautiful piece, it is not substantial enough in terms of length, technical difficulty, etc. IMO. If you are trying to impress the judges, you should do the 4th movement. I am assuming this is a contest for high school age (age 14+) or older performers. You mentioned this is a major national competition.
Yes, National YoungArts pretty big competition for 10-12th graders or 15-18 year olds. I didn't make it last year but I want to give it another go this time around. Thank you for your advice! I spoke with a few mentors and teachers just today and they suggested the 4th movement as well.