The subordinate clause is "When the delivery man arrives" because 1. it is introduced by "when" and 2. we can ask question to the main clause about this one.
1.the first one(A) 2.the last one (C) hope this helps
<span>B.) Ownership of land areas.<<
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<span>C.) They've grown to become trees, plunging deep roots into earth<<<</span>
