B. One sunny afternoon Rose ... 1) was riding her bicycle. 2) was trying to fly a kite. 3) was reading in the field.

Решение

В тексте сказано: "One sunny afternoon Emma was riding her bicycle. Suddenly she saw the girl who was trying to fly a big colorful kite in the field. It was Rose."

Из этого отрывка следует, что Роза пыталась запустить воздушного змея.

Ответ: 2) was trying to fly a kite.

Ты молодец! У тебя все отлично получается!