Albert and Louise, Ages 66 and 64, Respectively, Filed a Joint

Albert and Louise, ages 66 and 64, respectively, filed a joint return for 2019. They provided all of the support for their blind 19-year-old son, who had no gross income. They also provided the total support of Louise's father, who is a citizen and life-long resident of Peru. What is the amount of the credit for other dependents that Albert and Louise can claim?

A) $0
B) $500
C) $1,000
D) $2,000
E) None of these