About what time of day was it as Justin worked on the cattle pen?

Choices:
A. not enough information
B. Dusk
C. Morning
D. Late night
Morning
Justin Nelson, Jr., pounded the last of the stakes of his new cattle pen into the dry dirt. Like sentinels, they sprouted in a line from the barn, swerved north of the stream, veered at a right angle for the stump, and followed Justin to where he stood. The cross-beams remained, after which he'd finally be done.
He took a white handkerchief from his shirt pocket and wiped his forehead. The task had been lengthened considerably, although Justin refused to admit it, by incessant thinking, an activity which often stopped him with his hammer in mid-air. But now, he would soon be able to think all he wanted from the comfort of his porch as the cattle wandered from shade to shade. After he bought some cattle, he reminded himself.
Under the entirely blue vault of sky, Justin felt something pass between himself and the morning sun. His leathered face turned up to see nothing but ubiquitous light, curving toward him in all directions. He arched his aging back, feeling the popping and hating it more than usual, before wiping his neck and replacing the handkerchief. He had that feeling that he'd better drink something and sit down or he'd end up in that damn hospital again. Twice last year, whether he needed it or not, he went in for a check-up, and twice a year, some intern treated him like the village idiot. Truth be told, everyone who knew about him had treated him that way for nearly eleven years, except his niece. With a sigh escaping from the bellows of his withering chest, Justin shuffled back to the porch he had added onto his small two-room home. In the distance, a plume of dust was billowing off the road. Mail truck. Must be time for breakfast. About time I ate something.