C. To inform. Hope this helps :)
Answer:
The ancient records of China and Japan are said to contain many allusions to the use of natural gas for lighting and heating.
The author's tone is about the author's feelings towards the story of the poem.
<u>Explanation</u>:
- The author's tone and attitude is all about the feelings of the author and she expresses it more lightly. So she uses the pronouns we and our. She thinks to share her feelings to the people so she uses it.
- She is conveying her feelings in a understandable way to the readers so that readers can understand that. So she is introducing her topic in this way.
Nothing is underlined, but I assume that the underlined words would be either "to save" or "(not) to spend" or both. In any case, the correct answer would be C - infinitive phrase, because these verbs are in their infinitive form. "Gerund" and "participle" would end in -ing,
