It began happening in Nigeria, and now it affects the entire eastern half of the African continent. El Niño, a weather pattern, has negatively disrupted the whole region.

The El Niño it affects the entire eastern half of the African continent is described below in complete details.

Explanation:

“The consequences of the El Niño appearance have emerged in consecutive droughts and floods hitting many African continent 's countries, particularly those lie on the Horn of Africa and Southern Africa”, noted the UNOCHA spokesperson. ... However, other nations in the continent are supposed to receive massive rains which could appear in flooding which is another consequence of the El Niño.

a. i. only is correct.