It vs That

I hope above post helps you in some way

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I think you should read about it somewhere that can really help you.

Hope this one help. you can start with this link.
https://magoosh.com/gmat/2013/gmat-sent ... s-of-that/

In this Eg there is a clear difference in usage of that and it :
In the seventeenth century, the French astronomer Jean Picard became the first person to accurately measure the length of a degree of a meridian and used that to calculate the size of Earth.

A. the French astronomer Jean Picard became the first person to accurately measure the length of a degree of a meridian and used that to calculate the size of Earth.

B. the French astronomer Jean Picard became the first person to accurately measure the length of a degree of a meridian and made use of it in the calculation of the size of Earth.

C. the French astronomer Jean Picard made the first accurate measurement of the length of a degree of a meridian and used it to calculate the size of Earth.

D. the first accurate measurement of the length of a degree of a meridian was made by the French astronomer Jean Picard, and he used that to calculate the size of Earth.

E. the length of a degree of a meridian was first accurately measured by the French astronomer Jean Picard, who calculated the size of Earth with it.


Can anyone explain why c is correct and not b GMATNinja

This question is discussed in detail here: https://gmatclub.com/forum/in-the-seven ... 87148.html

Hope it helps.