This is a test of commonsense with single/multi-choices. Complete the next sentence:

How to study the chemical reactivity of organic amines
Learn what amines are.
Amines are organic hydrocarbons that are attached to nitrogen in a single bond manner. Amines are very reactive group of compounds.

Available choices:
1). You can learn about these acids by conducting research with a recently born specimen (discussed earlier) on topics that relevant to you, such as your skin chemical reactions. For aesthetic reasons, amines may be good for amino acids like good fats and omega 3 fatty acids.;
2). Per small atom of nitrogen (gp$ 250, gp$ 250) in chemical laboratory ics (gp$250 + 250) collectively are small or you have nitrogen present in co2, nitrogen, and nitric co2. One layer is nitrogen, which keeps nitrogen and nitric computing machinery free of everything else.;
3). This is so due to the existence of the electron lone pair on the nitrogen atom. The nitrogen atom in amines is relatively of low electro-negativity if we compare it with oxygen.;
4). If the molecules aren't side-by-side, they aren't the same compounds and only there are bonds of a certain form of the agents. Nitrogen is a marine compound and deficiency in amines affected in nitrogen increases the iron in the compound and aldosterone lowers nitrogen levels in high conditions because they are nitrogen molecules.;
The answer is:
3).