IX. Mark the letter A, B, C, or D to indicate the sentence that best combines each pair of sentences in the following questions.
"Joanna, please come to my office immediately," the boss said.
A.The boss invited Joanna to come to his office immediately.
B.The boss warned Joanna to come to his office immediately.
C.The boss asked Joanna to come to his office immediately.
D.The boss told Joanna please come to his office immediately.