The correct answer is (c), embryo formation.
Bryophytes and pteridophytes are both non-vascular plants. This means that they do not have xylem and phloem, which are the two types of vascular tissue that transport water and nutrients throughout the plant body. However, both bryophytes and pteridophytes do form embryos. An embryo is a young plant that develops from a fertilized egg. In bryophytes, the embryo develops within the female gametangium (archegonium). In pteridophytes, the embryo develops within the sporangium.
The other options are not common characteristics of bryophytes and pteridophytes.
(a) Vascular tissues are not present in bryophytes. This means that they cannot transport water and nutrients efficiently, and they are therefore limited in size.
(b) Thalloid plant body is a characteristic of bryophytes. A thalloid plant body is a simple, flat plant body that does not have roots, stems, or leaves.
(d) Haploid plant body is a characteristic of both bryophytes and pteridophytes. A haploid plant body is a plant body that contains only one set of chromosomes.