On Monday, a certain animal shelter housed 55 cats and dogs. By Friday, exactly `1/5` of the cats and `1/4` of the dogs had been adopted; no new cats or dogs were brought to the shelter during this period. What is the greatest possible number of pets that could have been adopted from the animal shelter between Monday and Friday? (a) 11 (b) 12 (c) 13 (d) 14