Final answer:
The phrase in bold letters, 'Presenting charts and graphs as proof,' is a participial phrase. A participial phrase is a phrase that begins with a participle (a verb that ends with -ing or -ed) and functions as an adjective to modify a noun or pronoun.
Step-by-step explanation:
The phrase in bold letters, 'Presenting charts and graphs as proof,' is a participial phrase
A participial phrase is a phrase that begins with a participle (a verb that ends with -ing or -ed) and functions as an adjective to modify a noun or pronoun.
In this sentence, the participial phrase is modifying the pronoun 'he,' providing additional information about how he illustrated the success of the marketing department.