The best and most correct answer among the choices provided by the first question is letter B which is geologists.
On the other hand, the best and most correct answer among the choices provided by the second question is  the letter B which is the walls of her house.
Lastly, the best and most correct answer among the choices provided by the third question is letter B which is some rope.
I hope my answer has come to your help. Have a nice day ahead and may God bless you always!