A.
Begin numbering at the end closest to the first branch, not the farthest.
Explanation:
As the Earth moves around the sun during a year, the northern half of the Earth is tilted towards the sun in the summer, making daytime longer than night. In winter, this reverses; the earth tilts away from the sun and nighttime becomes longer
The third compound will have a suffix of -yne. Alkynes are molecules that contain triple bonds.
