Final answer:
Bjorn's OAS benefit would be reduced by 15% due to his 6 years of residency outside of Canada.
Step-by-step explanation:
To calculate the reduction in Bjorn's Old Age Security Pension (OAS) benefit, we need to consider his years of residency outside of Canada. Bjorn has lived outside of Canada for 6 years from age 48 to age 54, which is a total of 6 years. According to the rules set by the Social Security Administration, for each year of residency outside of Canada, there is a reduction of 1/40th or 2.5% in the OAS benefit.
Since Bjorn lived outside of Canada for 6 years, the reduction in his OAS benefit would be 6 x 2.5% = 15%. Therefore, the correct answer would be C. 20% reduction.
Learn more about OAS benefit reduction