What does the author advise us in the last paragraph

Прочитайте текст. Запишите в поле ответа цифру 1, 2, 3 или 4, соответствующую выбранному вами варианту ответа.

What does the author advise us in the last paragraph?

1. To encode extra meaning of each handshake.
2. To express extra meaning with the language.
3. To ask our parents for some advice.
4. To learn the meaning of words and gestures at the age of 3.