Sasha has determined that her audience will consist of recently married couples looking to buy their first home. With this in mind, Sasha's next step in preparing her speech is to

i do believe the correct answer is the spread of chinese culture throughout asia and africa.good luck

explanation:

this null effect is caused by a weak manipulation and ineffective internal validity. in a scientific study, as the one dr. morimoto is trying to perfom, internal validity refers to the confidence placed in the cause-effect relationship and to how well an experiment is done and able to eliminate confounding variables.