The correct option is
A (a)-(ii), (b)-(i), (c)-(iii), (d)-(iv)
Spirogyra is a filamentous charophyte green alga of the order Zygnematales. Named for their beautiful spiral chloroplasts, within thin unbranched chains of cylindrical cells.
![](https://df0b18phdhzpx.cloudfront.net/ckeditor_assets/pictures/1393037/original_snip_6.JPG)
Chlamydomonas is a genus of green algae consisting of unicellular flagellates, found in stagnant water and on damp soil, in freshwater, seawater, and even in snow as "snow algae".
![](https://df0b18phdhzpx.cloudfront.net/ckeditor_assets/pictures/1392998/original_snip_6_1.JPG)
Volvox is a genus of chlorophyte green algae in the family Volvocaceae. It forms spherical colonies of up to 50,000 cells.
![](https://df0b18phdhzpx.cloudfront.net/ckeditor_assets/pictures/1393033/original_snip_6_2.JPG)
Giant bladder kelp (M. pyrifera) is the largest alga species, measuring up to 65 metres (215 feet) long.
![](https://df0b18phdhzpx.cloudfront.net/ckeditor_assets/pictures/1393044/original_snip_6_3.JPG)