A. Mary chose to celebrate the birthday ... 1) at home with her family. 2) at a restaurant with friends. 3) only with her closest friends. 4) outdoors in the countryside.

Ответ:

• 4) outdoors in the countryside.

Пояснение:

В тексте сказано: «Instead of having a party at home or at a restaurant she decided to organize a picnic in the countryside with her closest friends and family». Это означает, что Мэри решила отпраздновать день рождения на природе.