Answer:
Population management refers to the approach in order to control the human population.
There are several approach for population management such as birth spacing, condition of women and education, marriage at the proper age, measures of contraception, and female status upgrading.
Birth spacing is the interval that refers to how soon a woman can give birth to the next baby. Birth spacing as per WHO is 33 months and it can help in population management.
Condition of women and education refers to improve the women's condition and educate her more so that she can understand the consequences of more children on her health and on h Earth as well.
Marriage at the proper age keeps the mother and child healthy and parents will be mature enough to understand their responsibilities.
Measures of contraception help to avoid unwanted pregnancy and control the population on a large basis.
The goal was to persuade the States that the time had come to declare their independence from Mother England for the United Colonies.
"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:

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