Research Using Which Type of Procedure Has Demonstrated Preschoolers' Use

Research using which type of procedure has demonstrated preschoolers' use of intentionality to evaluate others' behaviour?

A) asking for judgments using moral dilemmas
B) evaluating differences in the morality of characters in described in different scenarios
C) observing differences in children's willingness to help others who accidentally or purposely hurt another person
D) meta-analytic review of previous research on the topic