Answer:
D: using competitive language when evaluating ideas
Explanation:
Choices seem to be ...
A: using subtle, indirect language in meetings.
B: allowing silence to linger in meetings.
C: expressing respect for others but letting issues go unresolved.
D: using competitive language when evaluating ideas.
E: expressing themselves in controlled, measured ways.
__
"Assertive" meaning "showing a confident or forceful personality", we don't expect subtle, or controlled language; nor do we expect lingering silence or unresolved issues. We expect choice D to be most likely.