MrAnd MrsVonce, Both Age 62, File a Joint Return for 2018

Mr.and Mrs.Vonce, both age 62, file a joint return for 2018.They provided all the support for their daughter who is 19 years old, legally blind, and who earns no income.Their son, age 21 and a full-time student at a university, had $4,200 of income and provided 70 percent of his own support during 2018.What is the other dependent credit Mr.and Mrs.Vonce may claim on their 2018 tax return?

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