Which sentence has a verb tense shift error?

a)
all of the cars in the parking lot today are parked illegally.

b)
kristoff worked hard on his diet, but he could not resisted snacking.

c)
marcia's lecture on the ming dynasty made the front page of the newspaper.

d)
sherel poured herself her third cup of coffee, without apology, and drank it.

The answer to your question would be that the sentence that contains a verb tense shift error is the following one: Kristoff worked hard on his diet, but he could not resisted snacking. That is, the answer would be B.

A  verb tense shift refers to the change from one verb tense to another within a sentence or paragraph.  In this case, the verb "resisted" should be in the bare infinitive form as it is preceded by the modal "could". That modal is already related to the past tense used in the first part of the sentence.

hi there!

one thousand and one nights, also called the arabian nights is a collection of middle eastern tales compiled in arabic during the islamic golden age, dated from the 8th to the 14th century. this collection was compiled of largely middle eastern and indian stories with an uncertain date and autorship whose tales such as aladdin, ali baba and sinbad the sailor -these ones were the most popular ones, the ones that have almost become part of western folklore.

as in much medieval european literature, the stories contained in this collection are set within a frame story. its scene is central asia, as known as "the islands or peninsulae of india and china", where king shahryar kills his wife after discovering her infidelities and as well as any other who betrayed him.   then, loathing all womankind, he marries and kills his new wife each day until no more candidates could have been found. his vizier had two daughters, scheherezade and dunyazad. the elder one -scheherezade- having devised a scheme to save herself and the others insisted that her father needed to give her in marriage to the king. each evening, she used to tell a story leaving it incomplete and promising to finish it the following night. the stories kept the king very interested, so eager to hear evey ending of each story, that he puts off her execution from day to day and finally he decided to give up with his plan. these stories are contained within the collection of 1001 nights, the bulk of the text is in prose, although verse is usually used for songs and riddles to express better the heightened emotion of them.

there is no excerpt.

put the excerpt in the comments and ill answer.