Read the dictionary entry. toolproof (adj): 1 designed to function despite human error 2 without possibility of failure

Which sentence uses the word foolproof as described by the second definition?

1.The new computers were not foolproof in the hands of untrained users.

2.Scientists were certain that despite being out of their control, the space probe would be foolproof.

3.The defense lawyer concluded his remarks with a foolproof argument of the defendant's innocence.

4.Foolproof methods of transportation may become a reality in the near future.

3.The defense lawyer concluded his remarks with a foolproof argument of the defendant's innocence.

Explanation:

Sentence number 3 is the one that uses the word foolproof as described by the second definition because it is stating that there is not any possibility to fail with this argument. In other words, it is saying that with that argument, the layer is going to win the case.

The other options use the term foolproof as something that is designed to function despite the human error, they all refer to an object or activity that involves human beings, and  that did or did not work despite human error

in the secret life of walter mitty, the main character leads a dull life, or so he thinks.in all his daydreams he plays the role of some hero or a man who is unbelievably resourceful.whether a pilot, a surgeon   or even a criminal, he is better, so much better than all the rest of the characters in his delusions.he comes up with ideas nobody else could have conceived .when he comes back to reality, whatever he has to deal with seems silly, boring without any motivation to deliver.

in a sound of thunder a hunter,eckles, wants to use a time machine to go back in time to catch a tyrannosaurus rex. by then, 2055 elections were go held and a   new hitler was beaten by a far better candidate, keith.once he and other men have traveled,   he gets cold feet. he in   some way has known   this is not a good idea.he hears this sound , too strong for him to put up with . hopeless, he abandons the project making a mistake - another one as the first is to travel in time-that causes a butterfly effect when he comes back. in the end , changes reality for worse; the anti human anti christ deutscher,   is the president.