Genes are the basic unit of heredity and continuous stretch of DNA which are linearly arranged on chromosomes. Replication of DNA copies the genetic information present in it which is transcribed into RNA by RNA polymerase enzyme. The RNA sequence of ribonucleotides is translated into the amino acid sequence of polypeptides (proteins) by the process of translation and proteins determine the physical and mental traits of organisms. Thus, genes control proteins synthesis. As we know that heredity is the transmission of genetic traits from one generation to next and genetic traits are determined by different types of proteins, the genetic information for the synthesis of which is present in genes. Thus, genes control protein synthesis and heredity through DNA replication, transcription and translation (the central dogma). An enzyme is a protein that accelerates the biological reactions and genes control enzyme synthesis through the central dogma, not their reactivity. Thus, the correct answer is option B.