Answer:
I think your answer is either b or c but I think b is more likely to be your answer
Covalent bond is the type of bond which involves the sharing of valence electrons between two atoms.
This bond usually arises from the equal attraction of the nuclei of the two atoms for the electrons shared.
Ionic bond, on the other hand, arises due to the transfer of electrons from the valence shell of one atom to the valence shell of the other.
1,2,1,4 are your coefficients
The linear in "linear trinomial" states that the degree of any monomial (single variable) must be equal to 1. A trinomial implies that there are three variables. An example of a trinomial would be 2x - y + 3z, where there are three variables each to the first degree. Therefore, a linear trinomial could not have only one variable since three variables are required.