Carbon emissions from transportation vehicles in the US have amounted

Carbon emissions from transportation vehicles in the US have amounted to 1,866.7 Teragram CO2 equivalent in 2003, an increase of 24 percent compared to emissions in 1990, while accounting for 27 percent of the total sum of carbon emissions.


A. have amounted to 1,866.7 Teragram CO2 equivalent in 2003, an increase of 24 percent compared to emissions in 1990, while accounting for 27 percent of the total sum of carbon emissions Correct choice

B. has amounted to a total sum of 1,866.7 Teragram CO2 equivalent in 2003, an increase of 24 percent compared to emissions in 1990, while accounting for 27 percent of the total sum of carbon emissionsIncorrect

C. has amounted to 1,866.7 Teragram CO2 equivalent in 2003, an increase of 24 percent compared to emissions in 1990, while accounting for 27 percent of the total sum of carbon emissionsIncorrect

D. have amounted to 1,866.7 Teragram CO2 equivalent in 2003, an increase of 24 percent compared to emissions in 1990, while accounting for 27 percent carbon emissionsIncorrect

E. have amounted to 1,866.7 Teragram CO2 equivalent in 2003, an increase of 24 percent more compared to emissions in 1990, while accounting for 27 percent of the total sum of carbon emissionsIncorrect

Answer choices B & C are eliminated because of singular-plural mismatch. As has does not go with subject plural carbon emissions.
Answer choice D seems to be incomplete.
Answer choice E Increase and more are redundant.
So, A is the winner.

While I agree that there is redundancy in option A, I still think that option D is the wrong answer. Because option D says "while accounting for 27 percent" which means that the carbon emission produced by vehicles is 27% of itself! Hence an option with redundancy is better in this case.
So, the answer is A
Posted from my mobile device

can someone confirm the answer as in option A it is mentioned as "a sum total of" and sum & total have the same meaning which makes it redundant. So option D should be the best option

I believe that in option A or the intended meaning is bus transportation is 27% of carbon emission but in option D it says 27% carbon emission meaning 27% of bus transportation is carbon emission but for what? there is a slight change so, I went with A.

OFFICIAL EXPLANATION

Carbon emissions from transportation vehicles in the US have amounted to 1,866.7 Teragram CO2 equivalent in 2003, an increase of 24 percent compared to emissions in 1990, while accounting for 27 percent of the total sum of carbon emissions.


A. have amounted to 1,866.7 Teragram CO2 equivalent in 2003, an increase of 24 percent compared to emissions in 1990, while accounting for 27 percent of the total sum of carbon emissions

The original sentence is grammatically correct and the best option stylistically.


B. has amounted to a total sum of 1,866.7 Teragram CO2 equivalent in 2003, an increase of 24 percent compared to emissions in 1990, while accounting for 27 percent of the total sum of carbon emissions

Incorrect.

This answer choice is grammatically incorrect. The plural subject carbon emissions does not agree with the singular verb has.

What helps you identify this question as a Subject Verb Agreement question as well as identify this mistake is the following Stop Sign:

A long complex subject / a long distance between the subject and the verb

In addition, this answer choice is more wordy than the original sentence.


C. has amounted to 1,866.7 Teragram CO2 equivalent in 2003, an increase of 24 percent compared to emissions in 1990, while accounting for 27 percent of the total sum of carbon emissions

Incorrect.

This answer choice is grammatically incorrect. The plural subject carbon emissions does not agree with the singular verb has.


D. have amounted to 1,866.7 Teragram CO2 equivalent in 2003, an increase of 24 percent compared to emissions in 1990, while accounting for 27 percent carbon emissions

This answer choice is illogical. The phrase 27 percent carbon emissions has no intelligible meaning in this sentence.


E. have amounted to 1,866.7 Teragram CO2 equivalent in 2003, an increase of 24 percent more compared to emissions in 1990, while accounting for 27 percent of the total sum of carbon emissions

No, that's not it.

This answer choice is stylistically flawed. Using both increase and more is redundant.