The correct answer is: C. should be respected
The verb “respect” is a transitive verb, which means that it takes a direct object. In this case, the direct object is “elders.” The sentence “Elders should be respected” means that it is important to treat elders with courtesy and consideration.
The other options are incorrect because they do not make sense grammatically. Option A, “Elders should respect,” is a sentence fragment. Option B, “Elders should be respect,” is a verb phrase that does not have a subject. Option D, “Elders should have been respected,” is a past participle phrase that cannot be used as the main clause of a sentence.
It is important to respect elders because they have more life experience than we do. They have seen and done things that we have not, and they can offer us wisdom and guidance. It is also important to respect elders because it is the right thing to do. They deserve our respect, just as we deserve the respect of others.
There are many ways to show respect to elders. We can listen to them attentively, follow their advice, and treat them with kindness and courtesy. We can also learn from them and appreciate their wisdom. When we show respect to elders, we are making the world a better place.