Which one of the following best describes a typical yield spread movement (i.e. the difference between the YTM of a 10 year Government of Canada bond and a 10 year BBB corporate bond)? A) Yield spreads will decrease when there is a strong economy. B) Yield spreads will increase when there is a strong economy. C) Yield spreads will decrease when there is a weak economy. D) Yield spreads are determined by the Bank of Canada