Which of the following sentences is correct?

• One of এর পরে noun plural হয় ও verb singular হয়।
- Structure: one of + plural noun + singular verb
তাই নিয়মানুযায়ী সঠিক বাক্যটি হবে-  One of the problems is extremely easy to solve.

Example:
- One of my friends is a politician.
- One of my friends is a lawyer.
- One of my friends is an engineer.
- One of the most beautiful girls has come.
- One of the problems is extremely easy to solve.