Beat The GMAT a GMAT & MBA community

In their physical characteristics, bat species range from the hog-nosed type, the size of a bumblebee and weighing about as much as a penny, to fruit eating bats that weigh two pounds and have a wingspan of up to six feet.
A..
B. the hog-nosed type, the size of a bumblebee and weights about as much as a penny, to
C. the hog-nosed type, the size of a bumblebee and it weights about as much as a penny to
D. those of the hog-nosed type, equal in size to a bumblee and in weight about as much as a penny, to those of
E. those of the hog-nosed type, which is the size of a bumblee, weighing about as much as a penny, to those of

I chose B...

In 1797 Thomas Jefferson was not only the Vice President of the United States, but also the prsident-elect of the American Philosophical Society, the foremost scientific academy in the country, with a princial founder of it having been Benjamin Franklin.

A..
B. also the president elect of the American Philosophical Society, the country's foremost scientific academy, of which Benjamin Frankin had been a principal founder.
C. also was the president elect of the American Philosophical Society, being the country's foremost scientific academy, with Benjamin Frankin a principal founder.
D. he was also the president elect of the American Philosophical Society, which was the country's foremost scientific academny, with Benjamin Franklin having been a principal founder.
E. he was also the president-elect of the American Philosophical Society, the foremost scientific academy in the country, Benjamin Franklin of which being a principal founder.

"having been" vs "had been"; and "but also" vs "but he was also"..is there a difference??