The correct answer is true.
It is true that James Madison encouraged George Washington to attend and to support the Constitutional Convention.
Yes, it was James Madison who encouraged George Washington to attend the Convention if Philadelphia. But madison had the help of Henry Knox to pursue Washinton, considering that Washington was a well-respected man and his voice was going to be heard for his accomplishments during the Revolutionary War. They were right. Washington ended up being elected the first President of the United States.