"The mass of Substance C is five times the mass of Substance B", the given statement is correct.
Answer: Option D
<u>Explanation:</u>
As Jessie added 16 gm. of Substance A to 4 gm. of Substance B Obtained certain amount of Substance C which can be calculated as follows:
amount of Substance C = Substance A + Substance B = 16 + 4 = 20 gm
Therefore, 20 gram of Substance C was obtained. Here, fourth statement is correct which says the mass of Substance C ifs five times the mass of Substance B to justify this, see the below:

Mexico faces the challenges today are poverty and drug-related violence.
Answer: Option B and C
<u>Explanation:
</u>
As indicated by Mexico's national measurements organization, the second quarter of 2018 saw the pace of development in Mexico's economy contract.
Because of the combined impact of declining generation in the oil, rural and mechanical parts alongside the possibility of an extreme liberal system change set to take control in December.
The quarter was anticipated for a 0.1% constriction in GDP, yet the reexamined numbers currently show the pace of decrease really multiplied, down an occasionally balanced 0.2%, contrasted with last past quarter.
Mexico is famous for its drug cartels. These cartels and drugs are traded extensively across the borders between Mexico and the United States of America.
This has resulted in a drug war not only with countries like the Colombia and the United States of America but also within Mexico too. Although this does not happen in the open, it is something which has drawn the attention of the entire world.
Answer:
C. identify the elements of conscious experience
Explanation:
According to structuralists society is a system of networks where interactions among people takes place. The overarching structure that spans across a society must be studied.
In order to do this how an individual thinks must be understood. This task is the responsibility of the psychologists.
Hence, the goal of psychology is to identify the elements of conscious experience
Answer:
involved-soil exhaustion, the vagaries of nature, overproduction of staple crops, decline in self-sufficiency, and lack of adequate legislative protection and aid.
Explanation:
soil exhaustion was solved with the over growing of crops those are just a few problems