Which sentence is an example of direct characterization?

jake and sam shouldered the next pair of fifty-pound food packs and began another long trudge up the hill.

"oh, this is just swell," jake said, covering his ears to block out the sound.

jake had a short fuse when he was under stress, and this entire adventure was not bringing out the best side of his personality.

of course, staking a claim and striking it enormously rich on klondike gold had seemed like a wonderful idea last summer.

bring it bro

explanation:

recent news about two years ago indicates that a polish forestry student by chance unearthed at a depth of about 40cm (16 inches), during digging in a damp polish forest he found a 13-page manuscript into a thermos flask.

greek jew marcel nadjari was a aischwitz slave who witnessed how the nazi's built big death chambers and crematoriums and told how he was forced to escort fellow jews to the gas chambers. he accounts on this manuscript how the nazi's disguised this chambers to look like showers. also, he describes this place as a process of extermination from the chambers to the trains arriving to take the bodies.