Goal and options: machete
output answer: can kill a mammal easily.

Goal and options: How to nauturally kills weeds and grasses in flower beds.
output answer: First be sure to cover any plants you do not wash to harm, then spray a mixture of one gallon white vinegar; 1 cup salt; 1 tablespoon liquid dish soap on the unwanted grasses and weeds. You will notice them dying off in a few days.

Goal and options: how do you return a hit quickly on mturk?
output answer:
press the return button on the bottom right.