The most appropriate word from the group of answer choices to fill in the blank is: (c) painted
In English language, an adjective is one of the parts of speech and it can be defined as a word that qualifies or describes a noun in a sentence. Some examples of an adjective are big, small, happy, tall, short, fat, rambunctious, respectful, painted, etc.
Painted is the past simple tense and past participle of paint, which describes covering something with a coat of paint.
In this context, the awesome bar (a noun) is described as being painted (an adjective) with bright colors. Also, you should take note of the type of tense that's used to describe or qualify the awesome bar; it's a past simple tense of "paint" because the painting was applied in the past.
In conclusion, the correct sentence is "Awesome bar painted in bright colors."