<span>technological advances that lowered transportation costs dramatically</span>
Answer:
B. A tax loophole for corporations
Explanation:
For more info on what earmark is, go here; https://www.bing.com/search?FORM=INCOH2&PC=IC04&PTAG=ICO-3b7743ede47ed03f&q=earmark+defintion
Using irrigation to combat lack of natural resources <span />