An archegonium of Riccia has

(a)  4 neck canal cells, 1 venter canal cell and one oosphere

(b)   4 neck canal cells, 2 venter canal cells one oosphere

(c)   4 neck canal cells, one venter canal cell and two oospheres

(d)  6 neck canal cells, 2 venter canal cells and one oosphere

Ans. a