Pitons are{Fill_Regular}

Since pitons are spikes, the proper answer is option b. for instance, the mountaineer couldn't go hiking as he had forgotten to hold along his pitons.
Option a is wrong because spears and spikes are various things. A spear may be a weapon with a pointed head that's accustomed attack people while a piton is employed to wedge inside a rock. An example of a sentence is, ‘The man died in a very minute because the spear with which he was attacked by the tribals, was poisoned’.
Option c is inaccurate because a hammer could be a tool which will be wont to forge the piton into a rock. as an example, John got the nails from the buy hanging his portraits on the wall, but he forgot to induce a hammer.
Option d is additionally incorrect because a harpoon may be a weapon kind of like a spear but it's usually utilized in maritime activities like fishing. An example of a sentence is, ‘The harpoon couldn't catch one fish because it had been broken’.