Given below are 3 sentences, one or more of them is incorrect. Identify the one(s) that are incorrect and point out the incorrect section. 

I. Sanjay was very tired (a)/ from having practised all day, (b)/ so he got angry when (c)/ he saw the kitchen in a mess. (d)

II. Parul was going to (a)/ study further in the field (b)/ of Biology since she is still (c)/ interested in human anatomy. (d)

III. Michael is going to (a)/ have a tough time living (b)/ in a different country, especially (c)/ since he didn't know the language. (d)