Select the option that indicates the correct arrangement of the given words in the order in which they appear in an English dictionary.

1- Perplex
2- Peroration
3- Perpetrate
4- Perpetuity
5- Perpetual

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

1. Perplex
2. Peroration
3. Perpetrate
4. Perpetuity
5. Perpetual

All five words begin with the same first three letters: "Per".
Let us compare the 4th letter of each word:
- Word 1 (Perplex): 4th letter is p
- Word 2 (Peroration): 4th letter is o
- Word 3 (Perpetrate): 4th letter is p
- Word 4 (Perpetuity): 4th letter is p
- Word 5 (Perpetual): 4th letter is p

Alphabetically, o comes before p. Therefore, Word 2 (Peroration) comes first in the dictionary order.

Now, let's compare the remaining words (1, 3, 4, 5), which all share the prefix "Perp". We look at their 5th letters:
- Word 1 (Perplex): 5th letter is l
- Word 3 (Perpetrate): 5th letter is e
- Word 4 (Perpetuity): 5th letter is e
- Word 5 (Perpetual): 5th letter is e

Alphabetically, e comes before l. This means Word 1 (Perplex) will be sorted after Words 3, 4, and 5. Since Word 1 is the last among the "Perp-" words, it will be at the end of the sequence.

Now we compare the remaining words (3, 4, and 5) which share the prefix "Perpe". Let's compare their 6th letters:
- Word 3 (Perpetrate): 6th letter is t
- Word 4 (Perpetuity): 6th letter is t
- Word 5 (Perpetual): 6th letter is t

Since they all share "Perpet", we check the 7th letters:
- Word 3 (Perpetrate): 7th letter is r
- Word 4 (Perpetuity): 7th letter is u
- Word 5 (Perpetual): 7th letter is u

Alphabetically, r comes before u. Therefore, Word 3 (Perpetrate) comes next in the sequence (second overall).

Finally, we compare Word 4 and Word 5 which share the prefix "Perpetu". We look at their 8th letters:
- Word 4 (Perpetuity): 8th letter is i
- Word 5 (Perpetual): 8th letter is a

Alphabetically, a comes before i. Thus, Word 5 (Perpetual) comes before Word 4 (Perpetuity).

Putting it all together, the correct alphabetical arrangement is:
- 2 (Peroration)
- 3 (Perpetrate)
- 5 (Perpetual)
- 4 (Perpetuity)
- 1 (Perplex)

Thus, the correct sequence is 2, 3, 5, 4, 1.