Which factor encouraged Progressive reform efforts in the early 1900s? A. unions coming to agreements with businesses to avoid lockouts
B. transportation improvements that linked sections of the country
C. quotas that were enacted to limit the number of immigrants
D. rapid growth of immigrant populations in urban areas

brainliest is someone you pick by simply clicking a button. it only shows up if there are two people that answered your question, then you decide who answer more accurately with detail and explanation and you give that person the title "brainliest".

i hope this your understandings.

explanation:

damn girl thats not really your friend then. : /

we need the chart or check box