Answer:
→When we join or Append two sentences ,word And is used.
→Similarly ,for two sets, A and B, word And is used when we have to find common elements between two sets.
→2 and 3 means =2+3=5
→Here, In the Sentence, The lights are on and the TV is off , we used the word "And" for joining of two sentences.
→Conjunction are used for joining or merging of two sentences.
→Option A---Conjunction