Frank's grandfather loved to fish. Every time he came back from the lake, he described catching and releasing a bigger and bigger fish. We can infer from this story that Frank's grandfather likely engaged in: Group of answer choices

1. fishing to admire fishes, to see how big they were

2. fishing to test his ability in catching fishes

3. fishing

4. fishing not to catch fish and kill

5. Fishing to test if he still has the energy to fish

6. Challenging himself to catch bigger fishes.