An increase to an entity's valuation allowance might be called for when:

a$.$

The entity's last book profit occurred $10$ years ago,

O

$9$

The entity's assets have appreciated greatly in value, but there is no inclination to scll them.

c$.$ Both "The entity's last book profit occurred $10$ years ago" and "The entity's assets have appreciated greatly in value, but there is no inclination to sell them".

d$.$ Neither "The entity's last book profit occurred $10$ years ago" nor "The entity's assets have appreciated greatly in value, but there is no inclination to s ll them