Antibiotics would most likely be the best answer for this question.
So it would be A.
To personally establish trust with clients you can share any of your personal experiences. i would recommend to answer an questions give them alternatives and attempt to calm any nerves
Me, I would most likely use a wheel barrow ... First it is less work on you and the crew and second no one will get hurt ... Put all the bags of concrete that will fit in the wheel barrow and the wheel them over to the other side of the site ... Have one person stack them while you go and get more !!! I hope this helps !!! Mark me brainleist