Which of the following describes one of the central ideas of the text?

a
the effects of hawking’s disease on his body have not stopped him from making discoveries that have changed the way we understand the universe.
b
since developing als, hawking has stepped back from physics to focus more on contributing to disability rights.
c
in the first few years following his diagnosis of als, hawking was too disheartened by his new limitations to contribute to disability rights or physics.
d
while hawking’s mind continues to be sharp, his disease has prevented him from communicating his ideas to others.