There are 30 classes of senior two students in a school, with 56 students in each class, numbered from 1 to 56. In order to exchange learning experience, the class size is required to be 1.

Divide the whole population into segments with equal intervals. At this time, the interval is usually predetermined. In the 1 section, a starting number is determined by simple random sampling, and the sampling number is added to this number.

In this question, the students in each class are arranged from 1 to 56.

Students with class number 16 need to stay and communicate.

The samples thus selected adopt a systematic sampling method,

Therefore, choose: d.