I'm sorry. I _ you now. Could you explain it again

1. Am not understanding
2. hasn't understood
3. don't understand
4. was not understanding

выбрать правильный вариант

Правильный ответ:

3. don't understand

I'm sorry. I don't understand you now. Could you explain it again.

Глагол не принято употреблять в длительной форме, даже если действие происходит в настоящий момент.