The force of attraction between two charges is determined by Coulomb's law, which states that opposite charges attract each other and like charges repel each other.
In this case, Object A has a charge of -1 Coulomb. It will be most strongly attracted to the charge that is of the greatest magnitude and opposite sign. Among the given choices:
- +1 C (attracts)
- +2 C (attracts, stronger)
- -2 C (repels)
- -1 C (repels)
The charge that would be most strongly attracted to object A (-1 C) is +2 C, as it has the opposite sign and a greater magnitude than both +1 C and -1 C.
Therefore, the answer is +2 C.