A body starts moving from rest with constant acceleration covers displacement $$S_1$$ in first $$(p - 1)$$ seconds and $$S_2$$ in first $$p$$ seconds. The displacement $$S_1 + S_2$$ will be made in time :

A

$$(2p + 1)$$ s

B

$$\sqrt{(2p^2 - 2p + 1)}$$ s

C

$$(2p - 1)$$ s

D

$$(2p^2 - 2p + 1)$$ s