Albert and Louise,ages 66 and 64,respectively,filed a Joint Return for 2017.They

Albert and Louise,ages 66 and 64,respectively,filed a joint return for 2017.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.How many exemptions may they claim on their 2017 tax return?

A) 2
B) 3
C) 4
D) 5
E) None of the above