Final answer:
The word 'mettle' in the text refers to the stamina and vigor required to do something, indicating that Tanis will need to show her resilience and determination during the trek. Therefore the correct answer is 2 an object that commemorates a person or event
Step-by-step explanation:
Based on the text, the word mettle means the stamina and vigor required to do something. The context in which the word is used implies that Tanis is about to face a difficult challenge, which will require her to demonstrate her courage, resilience, or ability to cope with it. The trek over the mountain pass is not just a physical journey but a test of her grit and determination.
The passage illustrates that the term mettle is related to personal perseverance and strength of character, rather than referring to a basic element from which things can be developed (option 1) or an object that commemorates a person or event (option 2). Instead, mettle is closely associated with traits like grit and resilience, which are crucial for enduring tough situations and striving toward a goal or task, as described in the provided text.