GMAT Sentence Correction (SC) | Many studies of regional cuisines have linked meat-heavy

Many studies of regional cuisines have linked meat-heavy diets to heart disease andthey showed that when the local food is primarily vegetarian, average life span tends to be longer.

A)they showed that when the local food is primarily vegetarian,

B) shows that eating primarily vegetarian localfood,their

C)shown that for areas in which the local food is primarily vegetarian,the

D) have shown that for areas in which the localfood being eaten is primarily vegetarian,the

E)they showed that,