2 The museum workers found out the painting was missing A later that morning. C on Monday evening. B on Tuesday. D during the afternoon.

Чтобы ответить на вопрос, обратимся к тексту: At first, the museum workers assumed the official photographer was shooting pictures me painting in his studio. An afternoon and g passed by and it wasn't until the following they realised the precious artwork was. Следовательно, выбираем ответ A.

Ответ: A later that morning.