Josette's mother, Erlange St. Villien, has been having delusional beliefs that some kind of highly specialized radio transmitter was inserted into her tooth filling as part of an experiment being conducted by aliens from the planet Mars. Up until five months ago, Josette tried to convince her mother that the radio transmitter really did not exist. However, Josette has changed her mind and now believes that her mother's story is true. Josette is most likely experiencing:
a) Delusions of grandeur
b) Brief psychotic episode, with marked stressors
c) Delusional disorder, somatic type
d) Schizophrenia, first episode currently in acute episode

D.

Schizophrenia, first episode currently in acute episode

c, his tragic flaw to cause his downfall

the present continuous is a verb tense which is mainly used to indicates that an action is in progress at the moment of speaking.  

it is formed using: person + verb to be (am/is/are) +verb + - ing form  

example: i am studying at this moment .

in addition, the present continuous is also used in order to express things that will or will not happen in the near future.

example: i am having dinner with some friends tonight.

the speaker sometimes   uses it   to express that an action is repeated and it causes irritation on the part of the speaker

example: my sister is constantly complaining about everything.