Identify the choice that uses one or more transitions to correctly indicate a causal relationship. a. you solved some tough problems this week; join us at the office party. b. you solved some tough problems this week; however, you can't us celebrate the holidays at our office party. c. you solved some tough problems this week; next, us celebrate the holidays at our office party. d. you solved some tough problems this week, so now us celebrate the holidays at our office party.