The following sentence has been split into four segments. Identify the segment that contains a grammatical error.
After I complete my training program / I will have been joining a team of astronauts / and preparing to / embark on a mission to Mars.
The given sentence contains an error. Select the option that correctly rectifies the error.
Earlier, he was feeling better, but things took a turn for the bad.
A.
Earlier, he was feeling better, but things took a turn for the worst.
B.
Earlier, he was feeling good, but things took a turn for the bad.
C.
Earlier, he was feeling well, but things took a turn for the ill.
D.
Earlier, he was feeling better, but things took a turn for the ill.