Geography is the study of places and the relationships between people and their environments.
The answer is either B or D. Letter A doesn't make sense and letter C isn't right either because you need rainfall to have fertile plains.
Nevertheless, the unifying influence of the monsoons on the Indian subcontinent is quite perceptible. ... These monsoon winds bind the whole country by providing water to set the agricultural activities. Thus, in view of the above the monsoon is considered as a unifying bond for this subcontinent.
C. continental drift
(If the continent drifted apart, similar fossils were previously proximal would now be great distances apart)
I might be wrong, but I am pretty sure that the Mississippi River empties into the Gulf of Mexico. Hope I helped!!!
