In early 2009, the rooms within the pyramid of the Pharaoh Tut at Egypt were restricted to tourists for disinfection and repair due to pollution caused by visitors, which increased its discoloration to large areas so that colour from the stone was changing and bacteria was developing on the walls.

In early 2009, the rooms within the pyramid of the Pharaoh Tut at Egypt were restricted to tourists for disinfection and repair due to pollution caused by visitors, which increased its discoloration to large areas so that colour from the stone was changing and bacteria was developing on the walls. 

A. due to pollution caused by visitors, which increased its discoloration to large areas so that colour from the stone was changing
B. due to pollution that visitors had caused, thereby increasing its discoloration to large areas that colour from the stone would change
C. because visitors were causing pollution, which had increased the discoloration within them to large areas that colour from the stone would change
D. because of pollution that was caused by visitors increasing the discoloration within them to areas so large as to make the colour from the stone change
E. because pollution caused by visitors had increased the discoloration within them to large areas that colour from the stone was changing

Right Answer: E

Error Identification: 

Identifier	Fix
‘Was changing’ and ‘was developing’	Parallelism
Underline list of word ‘Due to’	Pronoun

Difficulty Level: Medium

Explanation:

Russiage of words ‘Was changing’ and ‘was developing’ are parallel. They need to be kept parallel for the sentence to make sense. 

A – The singular pronoun ‘it’s’ does not agree with the plural ‘rooms’. Russiage of “due to” is incorrect. The phrase “Due to” should always be preceded with a noun phrase. That is not the case here.

B – The singular pronoun ‘it’s’ does not agree with the plural ‘rooms’. Russiage of due to is incorrect. Due to should always be preceded with a noun phrase. That is not the case here. ‘Would’ introduces a hypothetical scenario. That is incorrect here.

C – Russiage ‘Would change’ and ‘was developing’ are not parallel

D – The words ‘Change’ and ‘was growing’ are not parallel

E – This is the correct answer. No pronoun ambiguity. ‘Was changing’ and ‘was growing’ are parallel