What is the result?

Given the code fragment:
LocalDate valentinesDay =LocalDate.of(2015, Month.FEBRUARY, 14);
LocalDate nextYear = valentinesDay.plusYears(1);
nextYear.plusDays(15); //line n1
System.out.println(nextYear);
What is the result?

A.
2016-02-14

B.
A DateTimeException is thrown.

C.
2016-02-29

D.
A compilation error occurs at line n1.