The force of attraction or repulsion between two charges is determined by Coulomb's Law, which states that like charges repel each other and opposite charges attract each other.
Given that object A has a charge of -1 Coulomb, it will be attracted to any positively charged object. Among the options provided, the only positive charge is +1 Coulomb and +2 Coulombs.
Thus, the object with the charge that would be most strongly attracted by object A (with a charge of -1 Coulomb) would be the one with the larger positive charge, which is +2 Coulombs.
Therefore, the object with charge +2 C would be most strongly attracted by object A.