Choose the most appropriate preposition to use in this sentence.
The conference was attended ________ three hundred delegates.
The most appropriate preposition to use in the given sentence would be "by": 

The conference was attended by three hundred delegates.
Complete the following task based on the instruction and optional input provided.### Instruction:
Choose the most appropriate preposition to use in this sentence.

### Input:
The conference was attended ________ three hundred delegates.

### Output:
The most appropriate preposition to use in the given sentence would be "by": 

The conference was attended by three hundred delegates.