A 67 year old lady is brought in by her 6 children saying that she has gone senile.Six month months after her husband's death she has become more religious, spiritual and gives lot of money in donation.She is occupied in too many activities and sleeps less.She now believes that she has a goal to change the society.She does not like being brought to the hospital and is argumentative on being questioned on her doings.The diagnosis is -

• A. Depression
• B. Schizophrenia
• C. Acute manic excitement
• D. Delusion