3 years ago the average age of a family of 5 members was 17 years. A baby having been born, the average age of the family is the same today. The present age of the baby is

• A. 1 year
• B. <table><tr><td rowspan="2">1</td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;">1</td><td rowspan="2">years</td></tr><tr><td style="text-align: center;">2</td></tr></table>
• C. 2 years
• D. 3 years