i believe it is ok to test on animals. animals have a similar makeup to what human bodies have, so to lessen the loss of human lives, people should test on animals. as long as they are kept in a humane environment and treated well before, during, and if they survive, even after the tests, then yes! testing on animals is a great way to preserve human lives when testing dangerous products.
assuming the underlined sentence is:
"approximately 250 big name scientists will be winging their way to washington, d.c. "
the correct answer would be:
d) approximately 250 well-known scientists will be arriving in washington, d.c.
the word "big-named" is making reference to a well known, successful important or famous person, product or company, in this case, given is an international research institute convention these ones are scientists.
there is nothing to read