Which sentence does not contain any errors in comma usage? a. the puffy cloud looks like a giant, white rabbit. b. this is the cleanest, and most dazzling city i've ever visited. c. the colder, lighter meal will taste great on this hot day. d. this scary thrilling and wild roller coaster is not for everyone.

Ok lets eliminate the possible choices.

 A.) You never insert a comma after the adjective(s) have begun describing the noun. Although in some cases you will see it, but that only when listing.

B.) There is never a need for a comma if the word 'and' is present. A comma practically means 'and' in a sense.

C.) This seems to be the correct option.

D.) This does not even contain a comma so its an easy elimination.

Hope I helped. :) Thanks for using ! :D  

not concrete, existing in thought or as an idea but not having a physical or concrete existence

greet them:

buenas noches.

that is considered night time which is when "good night" is used.