A source emits a sound and is represented by the red dot in this map. Four people are located around the source, and the circles represent the sound wave.

As the source moves west, which person hears the highest pitch?

person A

person B

person C

person D

For cyclohexane compounds drawn in a chair conformation:   -axial bonds are vertical  -equatorial bonds are parallel to two bonds within the ring.  thus, as i assume the chair conformation is drawn:   -the x group is in an axial position, as are the five other vertical bonds.  -three axial bonds are on the top face of the ring  -the other three axial bonds are on the bottom face  the position of the second substituent on each ring carbon is equatorial.  gauche groups must be on an adjacent carbon such as carbon 6 and carbon 2, and also gauche groups are rotated by 60 degrees relative to each other.  drawing the newman projections for c1–c2 and c1–c6 aids in visualizing the groups that are gauche to the y group on c1.  click this link and watch some academic videos that may you more understand the topic 

Maybe you should get some from your teacher and learn more so you can get your grades up and maybe study a bit more

The answer to your question would be c. mineral oil