Its when you dont add commas , periods etc..
example --- the kid went out and play with his friends and he also forgot to come home on time he got in trouble and he cant do anything.
there is many commas missing that is a run on.
He sells the dog to General Miles.
B.
Not A. because it isn't only for solving simple problems.
Not C. because it CAN work well with personal or school problems.
Not D. because you can't solve a problem before their is a problem.
I hope this helped.
<span>maniac, madman, madwoman, imbecile, psychopath, psychotic; fool, idiot;eccentric; informalloony, nut, nutcase, nutjob, head case, psycho, moron, screwball, crackpot, fruitcake, fruit loop, <span>loon</span></span>