Final answer:
Char and Russ Dasrup can claim their daughter Siera as a dependent qualifying child. Angela, who is not their biological or legally adopted child but lives with and is supported by the Dasrups, may be claimed as a dependent qualifying relative, providing that all criteria set by the IRS are met.
Step-by-step explanation:
To determine who Char and Russ may claim as dependents for the current year, we need to understand the IRS rules regarding qualifying child and qualifying relative. According to the IRS, a qualifying child must be your child, stepchild, foster child, sibling, half sibling, stepsibling, or a descendant of any of them; must be under the age of 19 at the end of the year and younger than you (or your spouse if filing jointly), unless the child is a student; and must live with you for more than half of the year. There are also support and joint return tests to consider.
Based on the information given, Siera is the biological daughter of Char and Russ Dasrup, and she lives with them full-time; thus, she clearly qualifies as a dependent qualifying child. Now, for Angela, while she is not their biological or legally adopted child, she has lived with the Dasrup's for an extended period and is supported by them, which may allow her to be considered a dependent qualifying relative if all other IRS tests are met.
Therefore, the correct answer is: C. They may claim Siera as a dependent qualifying child and they may claim Angela as a dependent qualifying relative, assuming all other IRS criteria for a qualifying relative are met which include that Angela must not have provided more than half of her own support, must not be claimed as a dependent by someone else, and must be a U.S. citizen, resident alien, or national.