Which taxpayer is potentially eligible to receive the Child Tax Credit? In each scenario, the child mentioned is the taxpayer's only dependent or potential dependent, and the taxpayer provided more than half the child's support.

A. Abigail has a daughter, Malena, who is 7 years old at the end of 2019. Malena lived in Mexico for all of 2019 and is not a U.S. citizen, U.S. national, or U.S. resident alien.

B. Lucia has a niece, Alejandra, who was 9 years old at the end of 2019. Alejandra is not a citizen of the United States. Alejandra does have an Individual Taxpayer Identification Number (ITIN), and she lived in Mexico for all of 2019.

C. Ian has a nephew, Dylan, who is a resident alien. Dylan was 16 years old at the end of 2019. Dylan lived with Ian all year. Dylan obtained a social security number valid for employment before the due date of the return.

D. Perry has a son, Ryan, who was 17 years old at the end of 2019. Ryan is a citizen of the United States and qualifies as a dependent on Perry's 2019 tax return.