Final answer:
An army captain is likely to be the most stringent among the given options due to the demanding nature of military discipline and the need for a strict command structure.
Step-by-step explanation:
An army captain is most likely to be stringent due to the nature of military discipline, which enforces strict adherence to rules and regulations. Stringency is crucial in a military context, where order and obedience are paramount for effectiveness and safety. The role of an army captain includes maintaining discipline, training soldiers, and ensuring operations are carried out with precision.
Comparatively, a teenage actor operates in a more flexible and creative environment, a humorous storyteller thrives on flexibility to adapt their narrative, and a lazy shepherd is unlikely to exercise strict discipline in their work. rigorously binding or exacting; strict; severe: stringent laws. compelling, constraining, or urgent: stringent necessity.