Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that best combines each pair of sentences in the following questions.
A thermometer is an instrument. We use it to measure the temperature.
A.We use it to measure the temperature which is a thermometer.
B.A thermometer is an instrument which is used to measure the temperature.
C.We use thermometer which measure the temperature.
D.A thermometer is an instrument which we use it to measure the temperature.