Answer:
The correct answer would be option E, The ten-hut. Tran is exhibiting the Ten-Hut gesture during his speech.
Explanation:
Tran was giving speech and didn't know what to do with his arms, so they kept them still behind on his hips, just like army men do. This gesture represents, 'Come to Attention'. This Come to Attention gesture represents The Ten Hut stance. It is basically a military term, which came into use because it was easier to shout The Ten Hut, rather than Attention, which means come to attention. And Tran represented this gesture during his speech by stiffing his hands.