my explanation being if you don't know what a word is you will have no clue of what it is and context clues help you better understand for example the word rope if you have no clue what the text means by rope you can use basic knowledge from the text such as "she climbed the rope" or "she weaved a rope out of horse hair and sheeps wool" both of the texts can help us figure out that rope with a thick and strong material that its durable and helpful especially when in times of troubles such as rock climbing so therefore the first answer is correct.
