The correct option is C I have washed the dishes and put them away.
Sentences are mainly divided into four types: declarative, imperative,
interrogative and exclamatory. Declarative sentences merely declare or
state something, imperative sentences express a command, an order or a
request, interrogative sentences intend to ask a question and
exclamatory sentences display extreme or sudden emotion. The sentence in option C declares an action, hence it's a declarative sentence and C is correct. A intends to ask a question and B expresses a sudden emotion. Hence they are not declarative, so A and B are incorrect. Option D is incorrect because the correct option lies in C.