Answer this correctly

by 1860, accounted for half the exports of the u. s. overseas and was a critical crop for the national economy.

select the best answer from the choices provided.
a.
rice
b.
cotton
c.
wool
d.
sugar

wood carving remains today the primary sculptural art form of the sub saharan continent. african art history shows the earliest wooden sculptures from the 17th c are attributed to the kuba, central zaire but the earliest surviving sub-saharan sculpture is a zoomorphic head found in 1928 in central angola.

i hope this .