Martha believes that if she doesn't keep checking the stove in the kitchen,there may be a gas leakage and an explosion.Consequently,Martha keeps checking whether the stove has been turned off over and over again,sometimes over fifty times a day.This practice interferes with her sleep and disturbs her thoughts.In the context of anxiety and anxiety-related disorders,Martha's recurrent thoughts about the possibility of an explosion are called _____.
A)delusions
B)compulsions
C)hallucinations
D)obsessions