Unless the storms pass, the game is likely to be rescheduled on another day. in this sentence, what type of connection word is "unless"? transition coordinating subordinating fluency

The correct option is SUBORDINATING.
Conjunction is a word which connects two words or phrases together in a sentence. There are two types of conjunction, coordinating and subordinating conjunctions.
A subordinating conjunction is one which connects two unequal parts of a sentence. An example of this is 'unless'.