Here are the correct answers for each question based on the pronunciation of the underlined parts:

1. A. children **(C)** - The “ch” is pronounced differently than the other options.
2. A. cave **(D)** - The "a" in "cave" has a different pronunciation.
3. A. tree **(B)** - The "ee" differs from the other vowels.
4. A. scenery **(B)** - The "sc" here has a different vowel sound than the rest.
5. A. mum **(B)** - The "u" sound is different from the other choices.
6. A. heavy **(B)** - The initial "h" sound is different than the others.
7. A. establish **(A)** - The "es" sounds differently compared to the rest.
8. A. bad **(C)** - The vowel sound differs from others.
9. A. area **(C)** - The "ea" is pronounced differently.
10. A. company **(B)** - The "o" sound is distinct.

11. A. benefit **(C)** - The "ben" has a different pronunciation.
12. A. adopt **(B)** - The "a" sound is distinct.
13. A. chemical **(D)** - The "ch" sound is different.
14. A. charity **(B)** - The "a" sound is different from the other choices.
15. A. centre **(C)** - The "en" makes a different sound than the other options.

For the second section, the answers would be:

1. A. homeless **(C)** - The "ho" differs from the other sounds.
2. A. reduce **(B)** - The "re" has a varying pronunciation.
3. A. rubbish **(C)** - The "rub" sound is distinct.

If you need additional questions or clarifications, feel free to ask!