Pick the correct option to complete the following sentence.
The officer was pleased ----- the work his subordinate did.

Option B is the correct answer.

The verb "pleased" typically takes the preposition "with" when expressing satisfaction about something.

Option A:  "Pleased at" is less common and typically used with specific events or outcomes (e.g., "pleased at the news"). It is not suitable for describing satisfaction with something.
Option C: "Pleased on" is not a standard phrase in English and is grammatically incorrect in this context.
Option D: "Pleased upon" is also a non-standard form of writing and does not fit here.