Native to south america, when peanuts were introduced to Africa by Portuguese explorers early in the sixteenth century they were quickly adopted into Africa's agriculture, probably because of being so similar to the Bambarra groundnut, a popular indigenous plant.
(A) when peanuts were introduced to Africa by Portuguese explorers early in sixteenth century they were quickly adopted into Africa's agriculture, probably because of being
(B) peanuts having been introduced to Africa by Portuguese explorers early in the sixteenth century and quickly adopted into Africa's agriculture, probably because of being
(C) peanuts were introduced to Africa by Portuguese explorers early in the sixteenth century and were quickly adopted into Africa's agriculture, probably because they were
(D) peanuts,introduced to Africa by Portuguese explorers early in the sixteenth century and quickly adopted into Africa's agriculture, probably because they were
(E) peanuts,introduced to Africa by Portuguese explorers early in the sixteenth century and having been quickly adopted into Africa's agriculture, probably because they were
probably because of being so similar to the Bambarra groundnut, a popular indigenous plant.the entire sentence talks about peanuts,so A out due to presence of WHEN.
IN OPTION B "having been introduced " AND "being".nonsencical and wrong almost all time both from meaning and constuction point of view.
in E AND D VERB IS MISSING FOR PEANUTS,IF YOU REMOVE THE STATEMENT IN BETWEEN COMMAS.
C IS OA