Answer:
The correct option is 1. carbon-carbon bonds
Explanation:
It is called covalent bonding to a type of chemical bond, which occurs when two atoms bond to form a molecule, sharing electrons belonging to its most superficial layer, thereby reaching the well-known "stable octet". Carbon-carbon bonds are covalent bonds, which take place between two carbon atoms. There are simple bonds, which are generally the most common, since it is formed by two electrons, each one of one of the atoms participating in the bond.
The rest of the options belong to the groups of non-covalent interactions, these do not share electrons.
The ionic interactions and forces of Van der Waals interactions are purely electrostatic in nature (attraction or repulsion of electric charges), although neutral molecules participate in the latter, interacting well with other neutral molecules or with ions. The hydrogen bond or hydrogen bridge also has an electrostatic nature, but simultaneously has a certain covalent character. Finally, hydrophobic interactions depend on the high degree of water disorder, (that is, on its high entropy) and are characteristic of those molecules that cannot easily interact with water.
