Question

in the centre. brightly, who was at the pivot, watching the alignment, was exasperated beyond endurance. he passed swiftly down the front, and struck the flat of his sword against belchers breastplate with force enough to make it clatter.
\keep back!\ he shouted; \keep back! an idiot would know enough to keep the line!\
the platoon was no sooner halted than belcher stepped one pace to the front, and brought his hand up against his musket at the shoulder with a force that made it rattle, thus signifying his desire to speak.
\step back into the ranks, sir!\ ordered brightly. \take your place, i say!\ as the lad hesitated. \ill do what talkings to be done, and youll obey orders!\
belcher stepped back, muttering angrily, his face pale with passion and his eyes flashing fiercely.
according to the text, belcher indicates his desire to speak by:
○ stepping forward and slapping his hand against his musket.
○ responding loudly to the lieutenant.
○ leaving the company.
○ muttering under his breath.

Explanation:

The text explicitly states that Belcher stepped one pace forward and brought his hand up against his musket at the shoulder (making it rattle) to signal his desire to speak. This matches the first option, while the other options do not align with the described action.

Answer:

stepping forward and slapping his hand against his musket.