Answer: The world is a happy place.
Explanation: Articles are used to determine whether a noun is definite or indefinite in a sentence. The is used when we want to specify something definite (a particular person or thing). On the other hand, a and an are used when the noun we want to refer is not something specific but a general one.
Here, place is used in a general way. It is not something specific. Moreover, article 'a' is used before the word beginning with a consonant sound. So, a is right here.