Arrange words alphabetically:
- Internal
- Introduce
- Introvert
- Intrude
Check order:
1. Internal (starts with 'Inte')
2. Introduce (starts with 'Intro')
3. Introvert (same prefix 'Intro', then 'v')
4. Intrude (same prefix 'Intru', then 'd')
So, dictionary order is: (d), (a), (c), (b)