Answer:
The correct answer is "covalent bonds".
Explanation:
A covalent coordinated or dative bond is formed when two atoms are linked together, sharing a pair of electrons. But only one of these atoms is the one that brings the pair of shared electrons. For this type of bond to occur, it is required that the donor atom has a pair of free electrons in an outer orbital and the acceptor atom has the capacity to receive that pair of electrons in its last valence layer.
On the other hand, a Lewis base is a substance that can share or donate a pair of electrons, because they have a pair of solitary electrons. A Lewis acid is that substance that accepts or takes a pair of electrons because they have their last electron layer incomplete.
It is then possible to say that an Lewis acid-base reaction is formed by the Lewis acid and base joined by a coordinated covalent bond.
So, <u><em>the correct answer is "covalent bonds".</em></u>