In option 1, Boric acid (A) is matched with Antiseptic (1). This is a correct pairing, as Boric acid is widely used as an antiseptic due to its germ killing properties.

Citric acid (B) is matched with Food preservative (2). This is also correct, as Citric acid is a natural preservative used to add an acidic, or sour, taste to foods and soft drinks.

Magnesium (C) is matched with Antacid Hydroxide (3). This is accurate, as Magnesium hydroxide is an antacid used to neutralize stomach acid.

Lastly, Acetic acid (D) is matched with Pickle (4). Acetic acid is the main component of vinegar, and is commonly used in pickling to preserve foods.

None of other options accurately match the compounds with their respective uses. Hence, the correct answer should be option 1.