The correct options are
A To be kind and respectful about others' lives, including that of animals.
C To think more about ourselves than simply accepting what he said.
D Life is full of suffering and unhappiness caused due to our cravings and desires.
One of Buddha's teachings was that 'life is full of suffering and unhappiness'. He also taught to be kind and respectful towards others, especially animals. He also wanted the people to think about themselves and think beyond his sayings.