Bonjour Madame Cécile !

While attempting a kwiz ,I was provided with the following sentence ->

Les enfants ont rangé les cadeaux _________ sapin de Noël .

The answer marked correct was -> au pied du (at the foot of)

However, I would like to ask whether the options - “au dessous du / autour du” are correct ? 

Just wanted to convey a small request-

Whenever, you feel free and comfortable, kindly help me ( as you always have done) with my queries which I posted lately as follow-ups .

Merci encore ! 

Je vous souhaite une bonne journée !