Mechanism of a hypothetical reaction $$X_2 + Y_2 \rightarrow 2XY is given below:
(i) X_2 \rightarrowX + X (fast)
(ii) X + Y_2 \rightleftharpoons XY + Y (slow)
(iii) X + Y \rightarrow XY (fast)
The overall order of the reaction will be

A

0

B

1.5

C

1

D

2