The correct option is B A
Let’s examine the sentence: “I and my family will read together.” The sentence uses two subjects separated by the conjunction ‘and.’ When I is used in conjunction with one or more nouns/pronouns as subjects, it always comes last. For example, “Frank and I went to the store.” So, the given sentence should switch the positions of ‘I’ and ‘my family.’ So, the sentence should read: “My family and I will read together.” So, the error is in Part A of the sentence. Hence, Option A is the correct answer.