Answer this question 50points

which of these sentence is a run on sentence?
a. mark took his exams, and he passed
b. mark took his exams; he passed.
c. mark took his exams he passed.
d. mark took his exams. he passed.
e. mark took his exams. he passed them.

c is the answer there isn't any kind of nouns or other pauses or break in the sentence other than the period.

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).

1# the answer is c

2#the answer is a