Final answer:
In sentence 17, 'were transferred' should be changed to 'was transferred' to match the singular subject 'each steel rail'. The correct answer is option G.
Step-by-step explanation:
The change that needs to be made in sentence 17 is changing 'were transferred' to 'was transferred'. The subject of the sentence 'each steel rail' is singular, so the singular verb 'was' should be used rather than the plural 'were'.
The correct sentence should read: 'Each steel rail that the structure rolled over was transferred from behind it to in front of it.' As such, the answer is G: Change were transferred to was transferred.