Explanation:

Let's break down the meaning of each statement:

- P % Q: P is the sister of Q.

- P + Q: P is the son of Q.

- P ? Q: P is the husband of Q.

- P – Q: P is the brother of Q.

Now, let's analyze each option to see which translates to "A is the son-in-law of G":

1. A x U + S x G:

- A ? U: A is the husband of U.

- U + S: U is the son of S.

- S ? G: S is the husband of G.

- A is the husband of U, who is the son of S, who is the husband of G. A is a male and may be the son-in-law of G, but not definitively through these relations.

2. A + S % U x G:

- A + S: A is the son of S.

- S % U: S is the sister of U.

- U ? G: U is the husband of G.

- A is the son of S, but no link shows A is the son-in-law of G.

3. A – S + U x G:

- A – S: A is the brother of S.

- S + U: S is the son of U.

- U ? G: U is the husband of G.

- A is S's brother, who is U's son, making A U's brother-in-law, not son-in-law.

4. A x U % S + G:

- A ? U: A is the husband of U.

- U % S: U is the sister of S.

- S + G: S is the son of G.

- A is U's husband, U is the sister of S, and S is G's son. Therefore, A is G's son-in-law.

The correct answer is Option 4: A x U % S + G. This option denotes that A is the husband of G's daughter (U), making him G's son-in-law.