Based on the premise "We'll have to dine upstairs.", can we conclude the hypothesis "We'll have dinner upstairs." is true (see options)?

Available options: A). yes; B). it is not possible to tell; C). no;

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
B).