Answer:
The element that would most likely have an oxidation number of +1 is lithium (Li), option (C).
Step-by-step explanation:
Lithium has one valence electron, and it tends to lose this electron to form a Li+ ion with a noble gas electron configuration of helium. Since the Li atom loses one electron in this process, its oxidation number is +1.
Boron (B), carbon (C), and nitrogen (N) typically have oxidation numbers of +3, +4, and -3, respectively, under standard conditions. However, the oxidation number of an element can vary depending on the compound and the specific reaction involved.