Which of the following would  decreasethe resistance to the flow of an electric current through a body?  

R = ρ L/A. R= resistance, ρ= resistivity, L= length of the conductor. A = area of the conductor. Resistance is directly proportional to the length of the conductor. So if length of the conductor is decreased, resistance will also decrease. Hence A is the correct option

Aparagraph should contain a topic, a subject that will be a focused in the whole composition of the writing. to understand better, in the paragraph, a brief discussion of examples related to the topic should be discussed briefly. a complete paragraph must have an introductory part, a body, and a conclusion. 

a paragraph must have a unity especially the words used, it should not confuse the reader. there should be coherence in the subject being discussed. a topic sentence must be followed. most importantly, an adequate development in the structure from the beginning until to the conclusion.