Choose the correct option.

The tone of the poem .............................................

The tone of the poem undergoes transition. The poetess was driving from her parents’ home to the Cochin airport. Her mother was sitting beside her in the car. She suddenly had a look at her mother. She found that her mother was dozing with her open mouth. Her face was as pale as that of a corpse. The poet painfully realized that her mother is not going to live long. This painful thought haunted her. But soon she tried to put it off by looking out of the car window. She saw the young trees running past them. She looked at the merry children coming out of their homes. As she saw life and vitality in the outside world, the painful thought passed away from her mind.