Final answer:
Homes constructed after 1999 need to have AFCIs installed in circuits serving bedrooms, according to the National Electrical Code.
Step-by-step explanation:
In homes built after 1999, Arc Fault Circuit Interrupters (AFCIs) have been required on circuits serving bedrooms. The correct answer to this question is a. 1999. The National Electrical Code (NEC) started to require AFCIs in bedrooms beginning with the year 1999 in an effort to prevent electrical fires.