Question

winnow has the same or almost the same meaning as: cull out usher in call for back up

Explanation:

The word "winnow" means to remove unwanted elements or separate the good from the bad. "Cull out" also means to select and remove the unwanted or inferior items. "Usher in" means to mark the start of something new. "Call for" means to demand or require something. "Back up" means to support or move backwards. So "cull out" is the closest in meaning to "winnow".

Answer:

A. cull out