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I think it is D, a hydrogen ion.

Explanation:

The difference between a conjugate acid and a base is the presence of an extra proton in the acid, which can be written as HA, compared the base, which can be written as A-.

An example is carboxylic acid, which is COOH, and the conjugate base, COO-, where the difference is a hydrogen ion.

the equation that correctly represent the reaction for formation of ammonia is

n2+ 3h2 → 2nh3 (answer d)

1 mole of nitrogen gas (n2) react with 3 moles of hydrogen gas (h2) to form 2 moles of ammonia ( nh3). this is in a process known as haber process were iron is used as a catalyst and reaction take place that a higher temperature and pressure. the process is exothermic hence energy is released.

explanation: it gains negative electrons, therefore becoming negatively charged. as charge cannot be created, nor destroyed, only transferred, this leaves the wool positive. now that they have opposite charges, the two items attract.