For most of the school year the number of disciplinary actions taken weekly because of student misconduct at North High School has remained about the same—roughly ten a week. But for the last month the number of actions per week has gone down considerably—to about six per week. There can be only one reason: Last month the Ten Commandments were posted in the hallway outside the principal's office. This posting was the only significant recent change in the school.

Explanation:

This change can definitely be the reason for the drop in the numbers of disciplinary actions taken in the school. The drop can be attributed to the fact that, the students were able to see the commandments or the law which govern their behaviors. So, even if a student was not aware of the law before, he is now. And also, by seeing the commandment daily, there is like a message being passed to the subconscious memory which then guides the students anytime they may want to misbehave. Seeing the commandment almost everyday is serving as a remainder to the students that there are laid down principles and guideline which govern their stay in the school, and breaking these rules will result in disciplinary actions against them.

the answer is sail boat won the race , and it was going 8 feet per   second

the correct answer is option d. none of these. it is noted that options a, b, and c share the same content.

despite the valid answer provided at the last sentence of each of the options, a question/answer format shouldn't include humourous themed responses such as "you bet your thermal pj's we do." - unless of course, the answer is carried out in an informal environment. this could be replaced with a simple "yes" or "it is necessary".

the question should be re-phrased to a more appropiate syntaxis. instead of "do we need the greenhouse effect? ", it should be written as "is the greenhouse effect necessary? " in order to give it a general scope, instead of limiting the answer to the needs of "we" the humans.