Select the option that represents the correct order of the given words as they would appear in an English dictionary.

1. Dermatology

2. Derogation

3. Derivative

4. Derailed

5. Dermestid

6. Deregulation

To arrange the given words in alphabetical order as they would appear in an English dictionary, we compare them letter by letter from left to right:

1. Dermatology
2. Derogation
3. Derivative
4. Derailed
5. Dermestid
6. Deregulation

First, let's look at the first three letters of each word:
- All words start with the letters "Der".

Next, we compare the 4th letter of each word:
- 4. Derailed (4th letter is 'a')
- 6. Deregulation (4th letter is 'e')
- 3. Derivative (4th letter is 'i')
- 1. Dermatology (4th letter is 'm')
- 5. Dermestid (4th letter is 'm')
- 2. Derogation (4th letter is 'o')

Comparing these 4th letters alphabetically: 'a' comes before 'e', which comes before 'i', which comes before 'm', which comes before 'o'.

This gives us the partial order:
- First: 4 (Derailed)
- Second: 6 (Deregulation)
- Third: 3 (Derivative)

Now, we compare the words starting with "Derm" to resolve their order:
- 1. Dermatology (5th letter is 'a')
- 5. Dermestid (5th letter is 'e')
Since 'a' comes before 'e', 1 (Dermatology) comes before 5 (Dermestid).

Finally, we place the remaining word:
- Last: 2 (Derogation), since its 4th letter is 'o', which is the latest in alphabetical order among all 4th letters.

Putting it all together, the correct alphabetical sequence is:
4, 6, 3, 1, 5, 2