Which of the following sentences uses a colon correctly?
a. i like to go camping: but my friend likes to go shopping.
b. for my camping trip i packed a stove: a lantern: an ax: matches: and an emergency kit.
c. we visited four states last year: colorado, arizona, california, and nevada.
d. we visited: colorado, arizona, california, and nevada.

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.