Answer: Experimental
Explanation:
Experimental study is the study in which researcher has some control over the variables where he can experiment and test over the groups. Observational study provides no control to researcher .He can only observe the process.
According to the question, study conducted by farmer is experimental as farmer has the control over quantity variable of land , grouping choice of crop etc.He is dividing the land equally in four parts,sowing same crops into 4 groups in each piece depicts that he is testing or experimenting everything equally.
The buyers want the seller to sell 2 t-shirt at $40
The correct answer to this question is letter "D. The spread of advanced technology because of the Ming dynasty's policies of cultural expansion." The broad theme that characterized the period between 1450 and 1750 is that of the spread of advanced technology because of the Ming dynasty's policies of cultural expansion
