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

Insomnia

Insufficient

Instalment

Inscription

Instrument

Let's sort the words step-by-step in standard alphabetical order:
All words start with 'Ins'. Let's look at the 4th letter:

Inscription (5) → 'c'

Insomnia (2) → 'o'

Instalment (4), Insurance (1), Insufficient (3), Instrument (6) → 't' or 'u'. Let's order 'c' and 'o' first:

1st: Inscription (5)

2nd: Insomnia (2)

Now let's sort the remaining words: Instalment (4), Instrument (6), Insurance (1), Insufficient (3).

4th letter:

Instalment (4) → 't'

Instrument (6) → 't'

Insurance (1) → 'u'

Insufficient (3) → 'u'

Compare words starting with 'Inst':

Instalment (4) vs Instrument (6): 'a' comes before 'r', so (4) comes before (6).

Compare words starting with 'Insu':

Insurance (1) vs Insufficient (3): 5th letter is 'r' vs 'f'. 'f' comes before 'r', so (3) comes before (1).

Combining all sorted parts together, we get the sequence:
5, 2, 4, 6, 3, 1