Answer:
C (i think but this is kind of an open question)
Explanation:
The speaker can cause communication roadblocks when they do not fully or honestly disclose their thoughts and feelings, causing their messages to be mixed or unclear. If the speaker has an aggressive, passive-aggressive, or passive style of communication, that can result in communication roadblocks as well.
Why it isnt A: Being assertive can help with communication but that's only if you know what you want.
Why it might be B: If you can't clearly communicate with others when youre too passive cause you might not get your point across
Why it is most probably C: If youre too aggressive you cause others to either become more aggressive or passive and that cause nothing to get done
Why It isnt D: Being passive aggressive isnt good either cause it causes others to feed off your energy but with this people are too focused on not blowing up and sometimes they are calm enough to communicate even if its badly
So really all of these can cause roadblocks but I would go with B/C
