Which sentences have spelling errors?
jenna did not want her parents to medal in her personal life
there is no excuse for leaving the dishes dirty after you cook a big meal.
we studied the effects of the plague on france in my history class this week.
do you beleive that aliens have visited earth?
if you want to start playing the guitar, i would recommend beginning with an acoustic model.

*Jenna did not want her parents to medal in her personal life  is an incorrect sentence, it is using an incorrect verb,  the correct sentence is Jenna did not want her parents to meddle in her personal life, both words have similar phonetic sounds but different spelling and definitely different meanings

*There is no excuse for leaving the dishes dirty after you cook a big meal.  (correct)

*We studied the effects of the plague on France in my history class this week.  (Correct)

*Do you beleive that aliens have visited Earth? Is an incorrect sentence due to a spelling mistake, the correct spelling is "believe". Do you believe that aliens have visited Earth?

*If you want to start playing the guitar, I would recommend beginning with an acoustic model. (correct)

its repetition emphasizing that the chain is his own. sorry if i am wrong.

i think it may be b, i'm not exactly too sure on this. but b seems to make more sense.