Mr.Ing chose to fly to the conference in Los Angeles earlier than scheduled

_________ he would have extra time to visit some potential clients

a. so that

b. in order

c. even if

d.ahead of

여기서요 a번이 답이라는건 알겠는데

b는 왜 답이 안되는 건가요?? in order(that)은 답이 될수 없나요??

알려주세요~~ㅠㅠ