Explanation:

Let's break down the code.

PEN is written as 17717.

- Let's look at the letters and numbers:

- P is 16th letter, E is 5th, N is 14th. But 16 5 14 isn’t 17717.

- Notice the pattern: “17717” — seems like they’re doubling the first and last digits.

- If we separate: 1 | 77 | 17

- 1 (first letter of PEN in some sequence?), 77 (no clear mapping), 17 (last letter position?)

- But here's the trick: If you actually try mapping each letter to numbers:

- P = 16, but if you write P=16+1 = 17

- E = 5+2 = 7

- N = 14+3 = 17

- So possibly, they're adding 1, 2, 3 to each letter’s position.

- 16+1=17, 5+2=7, 14+3=17 ? 17717

Applying to CAP:

- C = 3, +1 = 4

- A = 1, +2 = 3

- P = 16, +3 = 19

So, CAP should be 4319.

Now, the options:

- 4319 — matches our result

- 2320 — no match

- 4219 — close, but not correct

- 2319 — not correct

Option 1 (4319) is correct.