Read the excerpt from The Building of Manhattan.

It was a monumental task: to design the world's tallest building, create as much usable rental space as possible, plan so it could be built within 18 months, and still have a handsome building. In the end, architect William Lamb worked on fifteen designs before his plan "K" was finally chosen.

Which phrase can be changed when paraphrasing this text?

a
“handsome building”
b
“within 18 months”
c
“plan ‘K’”
d
“William Lamb”