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

1. Complete

2. Complex

3. Compact

4. Compare

The correct option is 3, 4, 1, 2.

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

1. All four words start with the same initial four letters: C-o-m-p.

2. Next, compare the 5th letter of each word:
- Compact: 5th letter is 'a'
- Compare: 5th letter is 'a'
- Complete: 5th letter is 'l'
- Complex: 5th letter is 'l'

Since 'a' comes before 'l' in the English alphabet, the words starting with Compa- come before the words starting with Compl-.

3. Compare Compact (3) and Compare (4):
- 6th letter of Compact is 'c'
- 6th letter of Compare is 'r'
Since 'c' comes before 'r', Compact (3) comes before Compare (4).

4. Compare Complete (1) and Complex (2):
- The first six letters C-o-m-p-l-e are identical in both words.
- 7th letter of Complete is 't'
- 7th letter of Complex is 'x'
Since 't' comes before 'x', Complete (1) comes before Complex (2).

Combining these results gives the correct dictionary order:
3. Compact → 4. Compare → 1. Complete → 2. Complex

Therefore, the correct numerical sequence is 3, 4, 1, 2.