Nelson was seen laughing inappropriately in the library, as if he were responding to internal stimuli. on the bus home, he cried uncontrollably and suddenly became angered when a fellow passenger offered him a tissue. his excess of inappropriate behavior is known as:

The correct answer is: the presence of positive symptoms of schizophrenia.

Explanation:

Schizophrenia is a mental illnes, in which the sufferer may experience some early symptoms like depression, hostility or suspisciousness, inability to express joy, innapropriate laughter or crying, insomnia, etc... therefore we can clearly see and conclude that in Nelson's case his behavior is positive of the early symptoms of schizophrenia because of his delusional and irrational behavior.

because this was the year that the state of israel was formed