Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A) : Melting point of Boron (2453 K) is unusually high in group 13 elements.

Reason (R) : Solid Boron has very strong crystalline lattice.

In the light of the above statements, choose the most appropriate answer from the options given below ;

1. A Both (A) and (R) are correct but (R) Is not the correct explanation of (A)
2. B Both (A) and (R) are correct and (R) is the correct explanation of (A) Correct answer
3. C (A) is true but (R) is false
4. D (A) is false but (R) is true