Sevan, age 11 months, is wary of strangers. However, when his mother sits on the floor, Sevan ventures a few feet away from her for a few minutes at a time, and then returns to her for emotional support. Sevan is:.A) engaging in effortful control. B) exhibiting unusual behavior for a toddler with stranger anxiety. C) using his mother as a secure base. D) displaying avoidance rather than approach.

According to the federal regulations, which of the following studies meets the definition of research with human subjects? a researcher conducts a comparison of the comments made in a publicly available blog and the blogger's comments on a similar topic in a weekly magazine. undergraduate students in a field methods class are assigned a research question and asked to interview another classmate, to be followed by a class discussion on interview techniques. a cognitive psychologist enrolls undergraduate students for a computer-based study about the effect of mood on problem-solving behaviors. a researcher sets up a meeting with the superintendent of a large and diverse public school system to get data about the ethnic composition of the school system and the number of students receiving free lunches.