选出划分意群正确的句子。
It was really tough, but I’m glad  that all my hard work and training paid off.(  )
A、It was really tough, but I’m glad  that all my hard work /  and training paid off.
B、It was really tough, but I’m glad  that all /  my hard work and training paid off.
C、It was really /  tough, but I’m glad that all my hard  work / and  training paid off.