Answer:
The correct option is A
Step-by-step explanation:
A base is usually defined as a substance that produces hydroxyl/hydroxide ion (OH-) as the only negative ion when dissolved in water. However, Bronsted Lowry defined a base as a chemical substance that can accept a proton/hydrogen ion. Example of a Bronsted Lowry base is ammonia (NH₃).
Ammonia (NH₃) when dissolved in water (H₂O) forms Ammonium ion (NH₄+) and hydroxide ion.
NH₃ + H₂O ⇔ NH₄⁺ + OH⁻
From the equation above, we can see that ammonia (NH₃) accepts a hydrogen ion to become ammonium ion (NH₄⁺).