Which sentence is a run-on sentence?

a.
dad grilled burgers and hot dogs; mom made salad and set the table.

b.
after a string of close losses, the girls' softball team finally won a game.

c.
brandon threw the bananas away, they were rotten.

d.
john is happy to return home but sad to leave behind his friends from camp.

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the following key ideas correctly express the key sentence.

restate key idea: most people can learn to swim in ten short lessons.

restate key idea: the majority of water-accident victims require mouth-to-mouth breathing.

restate key idea: an empty, tightly closed gallon jug will support a tired swimmer.  

restate key idea: first aid is to prevent accidents as well as assist in rescue.

explanation: the key idea needs to have the same topic as the key sentence (drowning and safety).

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