The "A) My dog lunges and barks at squirrels" sentence is the correct sentence. This sentence is an example of a present tense positive sentence which describes a usual habit or fact in the sentence. The formula of the present tense positive sentence is "subject + verb/verb-s/es + adverb". The sentence includes verb-s/es if it has a singular third person subject as the sentence's subject.
Answer:A socialist economic system is characterized by social ownership and operation of the means of production that may take the form of autonomous cooperatives or direct public ownership wherein production is carried out directly for use rather than for profit.