英語がかなり得意な方お願いしますm(_ _)m



“Jane won't be able to attend the party tonight ? ”“Why not ?”
“She says her son's caught a cold and 《 》care of him. ”



�@must be taking

�Amust have taken

�Bwill have been taking

�Cwill be taking




《 》に入るのは何番だと思いますか？



何故その答えを選んだのかも教えて下さい。


宜しくお願いしますm(_ _)m