Why is a the only answer? Can't b be an answer as well? What is the difference between a and b?
A: The book club members want me to host our meetings at my house.
B: If I were you, I'd ___a___
a.be reluctant to
b.be reluctant to do
c.be reluctant to be
d.be reluctant to be doing
b would need 'that' following it.
Context is always important; labelling is rarely important.