"Er … ihr den Koffer tragen."
The correct option to complete this sentence is: b) helft.
In Russian, it would be translated as: "Er … вы поднимаете чемодан."
The verb "helfen" in German means "помогать" in Russian. So, the sentence translates to "You (informal plural) help carry the suitcase."
I hope this explanation helps clarify the correct answer for you! Let me know if you have any more questions related to languages or grammar.
