The psychological research on children is highly significant aspect, which essentially requires higher attention for ethical responsibilities.
Therefore, it is essential to get parental consent or guardian written consent and sometimes individual written consents from child prior to implementing protocols. Therefore, it is possible to avoid any legal problems under any circumstances and jurisdictions
Thus, the options (c), (a) and (d) are incorrect.
During clinical research but under extreme cases, confidentiality does not apply to some situations wither by therapist or patient. Therefore, it is essential to get parental consent or guardian written consent and sometimes individual written consents from child prior to implementing protocols.
Therefore, the correct option is – b). Each child's assent, when possible.