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Answer would be C I'm pretty sure.
An Adjectival Phrase - a group of words headed by an adjective that modifies a noun.
An Adjective - a word or phrase naming an attribute, added to or grammatically related to a noun to modify or describe it.
A Noun - a word (other than a pronoun) used to identify any of a class of people, places, or things
The two subjects of the sentence are Colonel Lloyd and his "finely cultivated garden".
One can be a great force even if one is not fully acknowledged.
Increasing would be the answer.