Final answer:
The charge of the cation in titanium(III) fluoride is +3, determined by balancing the total negative charge of the fluoride anions in the neutral compound.
Therefore, the correct answer is D) +3.
Step-by-step explanation:
The charge of the cation in titanium(III) fluoride can be determined by looking at the roman numeral in the compound's name. Titanium(III) indicates that titanium has a +3 charge. The fluoride ion, F-, always has a charge of -1. Since the compound is neutral overall, the total charge of the cations must balance the total charge of the anions. For titanium(III) fluoride, or TiF3, there are three fluoride anions, giving a total anion charge of -3. To balance this, the titanium cation must have a charge of +3. Therefore, the correct answer is D) +3.