Concept:
- In subject-verb agreement, you must identify the actual head noun of the subject, ignoring the prepositional phrases attached after it.
- A singular head noun takes a singular auxiliary verb such as 'does', not 'do'.
Step 1: Identify the true subject of the sentence
The subject is 'the richness', a singular noun, even though it is followed by the longer phrase 'of the tradition of debate and argument'.
Step 2: Ignore the distracting phrase in between
'Of the tradition of debate and argument' only describes the richness, it does not change the fact that the subject itself is singular.
Step 3: Match the correct auxiliary verb
Since the subject is singular and the sentence is in the present tense, the auxiliary must be 'does', not 'do' which is for plural subjects, and not 'has/have' which are for perfect tense.
Final Answer: Does