I narrow down to A and B, I understand why B is correct but get confused by A:
"attempts to use a statement about the consequences of actions to disprove a statement about the actions themselves."
I translate it this way: attempts to use the consequences "the grass would die" to disprove about the actions "walking across the grass".
Does it make sense? Could any one help and pinpoint the flawed part of the translation?
Thanks a lot!