Final answer:
The types of clauses that appear in Darrin's will are restrictive clauses determining specific conditions.
Step-by-step explanation:
The types of clauses that appear in Darrin's will are restrictive clauses determining specific conditions. Restrictive clauses provide essential information that is necessary to understand the meaning of a noun. They cannot be removed from the sentence without changing its meaning or rendering it nonsensical. In Darrin's will, these restrictive clauses would likely be specifying certain conditions or requirements that need to be met in order for certain provisions of the will to take effect.