Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that best combines the pair of sentences given in each of the following questions.1. Tom has been working all day. He must be tired now.
A.I think Tom must work all day and tired now.
B.Tom is tired now because he is working all day.
C.I’m sure Tom is tired after working all day.
D.I think Tom was tired all day working.