“For most of their histories, the United States and Canada have beena) closely tied economically and culturally b) distrustful neighbors of each otherc) economic competitors d) linked only by a common landmass”

“For most of their histories, the United States and Canada have beena) closely tied economically and culturally b) distrustful neighbors of each otherc) economic competitors d) linked only by a common landmass”

a) closely tied economically and culturally