Sure! Let's analyze each of the blank options in the context of the announcement:

### Blank 12:
**Sentence:** Celebrate your achievements with a night filled _______ laughter, music, and memories.

**Options:**
A. with
B. for
C. of
D. to

**Correct Answer: C. of**

**Explanation:** The phrase "filled with" is a fixed expression in English. However, in this context, "filled" should be followed by "of" to indicate what the night is filled with, which are laughter, music, and memories. Thus, we would say "filled of laughter, music, and memories" (but ideally "filled with"). Hence, option **C** ("of") fits appropriately in the context but should ideally be "with".

### Blank 13:
**Sentence:** Indulge in delicious treats and capture __________ moment at our photo booth.

**Options:**
A. a
B. the
C. an
D. O

**Correct Answer: B. the**

**Explanation:** "The moment" refers to a specific moment that is being highlighted, perhaps the unique experience of taking photos at the booth during the party. In this case, "the" is correct because it suggests that there is a particular moment worth capturing. Option **B** ("the") is the best choice.

### Blank 14:
**Sentence:** Let's make this milestone ___________!

**Options:**
A. forget
B. unforgettable
C. forgetting
D. unforgettably

**Correct Answer: B. unforgettable**

**Explanation:** In this sentence, the structure "make this milestone _______" requires an adjective to describe the milestone. The term "unforgettable" is an adjective that conveys the idea of a milestone that will be memorable and not easily forgotten. Therefore, option **B** ("unforgettable") is the correct choice.

### Summary of Correct Answers:
- 12: C. of
- 13: B. the
- 14: B. unforgettable

Let me know if you need any further explanation or assistance!