To solve this problem, we need to determine the type of organs represented by the forelimbs of a cat, lizard, whale, and bat.$\newline \bullet$Forelimbs of these animals serve different functions:$\newline$ - Cat and lizard forelimbs are used for walking.$\newline$ - Whale forelimbs are adapted for swimming.$\newline$ - Bat forelimbs are modified for flying.$\newline \bullet$Despite their different functions, these forelimbs have a similar underlying anatomical structure.$\newline \bullet$This similarity in structure, despite differences in function, indicates that these are homologous organs.$\newline$Homologous organs are derived from a common ancestor and exhibit similar anatomy but may perform different functions.$\newline$Therefore, the correct answer is Option 3: Homologous organs.