Correct Answer: congenial

Solution : The correct answer is the fourth option.

Explanation :
Hospitable implies a friendly and welcoming demeanour, particularly in the context of accommodating guests. Congenial is the most fitting synonym in this case, as it shares a similar positive connotation.

The meanings of the other options are as follows:

• Hostile : This term conveys an unfriendly or antagonistic atmosphere.
• Stingy : This term refers to being unwilling to give or spend.
• Unsocial : This term implies a lack of sociability or friendliness.

Therefore, the correct synonym is congenial .