Select the most appropriate collocation to fill in the blank.

Arun and his wife were _________ a baby boy after 18 years of their marriage.

blessed with

The most appropriate collocation to fill in the blank is blessed with.

The sentence is about Arun and his wife being happy to have a baby boy after 18 years of marriage. The word "blessed" is the most appropriate word to use in this context, as it refers to a gift from God.

The other options are not as appropriate:

• Delighted with means to be very happy with something. It would not be as accurate to use "delighted with" in this context, as Arun and his wife were not just happy with the baby boy, they were also grateful to God for giving them a child.
• Prepared with means to be ready for something. It would not be as accurate to use "prepared with" in this context, as Arun and his wife were not just ready for the baby boy, they were also excited and happy.
• Provided with means to be given something. It would not be as accurate to use "provided with" in this context, as Arun and his wife did not just receive the baby boy, they also created him.