I believe the upper left box is the correct response because both the sun and moon's gravity are impacting the tides.
Answer:
political instability
Explanation:
Sub-Saharan Africa is one of the most troublesome regions in the world. The region has lot of problems on pretty much every level, and one of the major issues is the destruction of the environment at a very fast rate.
Lot of funding is provided for the countries of this region, and lot of organization operate in it in order to help the people to solve the environmental problems, for the good of both them and the environment. Unfortunately, big portion of the governments are still very corrupt, the countries have very bad organization, and para-military organizations function in them, all of which contributes to creating chaos and instability in them.
The instability and the safety issues because of it, stop the people to do anything in particular when it comes to improving the environment, and with it their lives, as they are scared to move into certain areas as they might end up dead, like it is the case in Nigeria and the territory controlled by Boko Haram.
The answer would be D, as both the Earth and Moon have mass and thus a gravitational force (both the force of gravity and mass are proportional with each other, as seen with the equation ΣF=ma).
The movement of earth around the sun is called orbit