Which projective technique involves subjects completing a series of incomplete sentences?

The sentence completion test is a projective technique where subjects are provided with a series of incomplete sentences and asked to fill in the blanks with their own responses. This method allows researchers to gain insights into the subjects' thoughts, feelings, and attitudes, as participants often reveal subconscious motives and associations through their answers. It taps into the participant's free associations, helping to uncover unexpressed nuances about their perceptions or experiences related to a given topic.

In contrast, other techniques mentioned utilize different approaches. The word association test involves responding to a single word with the first word that comes to mind, focusing more on immediate reactions rather than deeper exploration of thoughts, as seen in sentence completion tasks. The storytelling technique asks participants to create a narrative based on prompts or visual stimuli, which focuses more on creativity and contextual responses. Projective drawing involves subjects creating pictures, which can reveal emotional and psychological states, yet it diverges from the textual completion task format inherent in the sentence completion test. Hence, the correct choice is indeed the sentence completion test, as it specifically employs the structure of incomplete sentences to elicit personal insights from subjects.