Consider Two Time Periods: T and K $c _ { t } = y _ { t } + y _ { k }$

Consider two time periods: t and k. Which of the following would represent the "future's" budget constraint?

A) $c _ { t } = y _ { t } + y _ { k }$
B) $$c _ { k } = c _ { t } + ( 1 + R ) y _ { k }$$
C) $c _ { k } = y _ { k } - \left( f _ { k } - f _ { t } \right)$
D) $c _ { t } = y _ { t } - \left( f _ { k } - f _ { t } \right)$
E) $c _ { t } = y _ { t } + ( 1 + R ) f _ { t }$