Which sentence has a pronoun-antecedent disagreement error?

each journalist has to decide what beat they want to cover.

it was so crowded that one of the girls lost her doll.

every student should hand in his or her assignment.

every boy scout has to sell his own cookies.

The correct answer is A. Each journalist has to decide what beat they want to cover.

Explanation:

In grammar, a pronoun refers to a word that replaces a noun, for example, "boy" can be replaced by the pronoun "he" or related words such as "his". In sentences, it is common nouns or proper names are not repeated over and over but pronouns are used to refer to the noun or antecedent. In this context, the antecedent and pronoun replacing it must agree in number and gender. In the case of "Each journalist has to decide what beat they want to cover" there is a pronoun-antecedent disagreement error because the pronoun used to replace "each journalist" is "they"; however, "journalist" is singular and should be replaced by "she or he wants to cover".

the answer is 'b' because the word 'attack' is a violent verb

6  then the  lord  said to cain, “why are you angry?   why is your face downcast?   7  if you do what is right, will you not be accepted? but if you do not do what is right, sin is crouching at your door;   it desires to have you, but you must rule over it.”

8  now cain said to his brother abel, “let’s go out to the field.”  while they were in the field, cain attacked his brother abel and killed him.