"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: