Explanation:

Let’s break this down step by step:

- The incomplete sequence is: G _ C T _ G P _ T _ G P C _ D _ P C _ D

- Let’s see each blank in context.

So, plugging in Option 2 (your answer): P, D, C, D, T, G, T

G P C T D G P C D T G P C D

Let’s line that up:

1. G P C T _

2. _ G P C T _

3. _ G P C D T _

4. _ G P C D T _

5. _ G P C D T G _

6. _ G P C D T G T

Oops, that’s messy. Actually, the series is:

G _ C T _ G P _ T _ G P C _ D _ P C _ D

Slot Option 2 in order:

1. G P C T D G P C T D G P C T D G P C T

But now compare this to the root structure. What’s happening is, the series skips forward by adding one more letter each time:

- G

- G P

- G P C

- G P C T

- G P C T D

- G P C T D G

- G P C T D G P

Here’s what that looks like with our missing pieces:

- G _ needs: P

- C T _ needs: D

- G P _ needs: C

- T _ needs: D

- G P C _ needs: T

- D _ needs: G

- P C _ needs: T

- D done!

So Option 2 is: P, D, C, D, T, G, T – it fits the pattern exactly.

- Option 2 follows the sequence, each blank aligns perfectly with the logic of adding the next letter in the series.

- Other options repeat or mismatch letters by placing, breaking the sequence.

- The key is to see that at each "_", you’re stepping through filling out "G P C T D G P C T" etc.

The correct answer is Option 2: P, D, C, D, T, G, T