The answer to your question is Letter C <-- ANSWER
Steroid is a molecule made up of four carbon rings with other atoms bonded to those rings.
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C because a lesion is high density
Common parts
nucleus
endoplasmic reticulum
mitochondria
ribosomes
golgi apparatus
plasma membrane or cell membrane
vesicles
B. Decreasing the surface area of solid reactant;
Why? Collision theory suggests that the more opportunities for reactants to come into contact or "collide" with other reactants, the faster the reaction will take place. Hence, decreasing the surface area will decrease the probability of collisions between reactants thereby decreasing reaction rate.