I would have to go with C or D. But I could not give a direct answer.
Answer:
The child that is next to the neighbour clockwise of the child in the first position.
Explanation:
If you pass cards anti-clockwise skipping each time the neighbour, in the first round you reach the neighbour clockwise of the first child with the 11th card; the second round is finished with card nr 21 that is received by the child next to the neighbour clockwise of the first child.
"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:

Answer:
While she had a high fever Ruthie experienced Option B. delirium.
Explanation:
We know that Ruthie experienced delirium and none of the other conditions listed because her altered mental capacity and state was just temporary. The other conditions listed are chronic diseases that are not curable in the case of Alzheimer's and Parkinson's, and dementia is an umbrella term for different neurological degenerations (including Alzheimer's which can cause dementia) generally progressive and degenerative, although some early cases can be treated and prevented from advancing more rapidly depending on the cause.