To build a bridge over a gap is to

• A. Bridging the gab
• B. Bridging the gap
• C. Spanning
• D. Crossing

Answer: (B)

The idea being tested is choosing the natural way to name the action of creating a connection over a gap. “Bridging the gap” is the standard expression for the act of connecting across a divide, whether literal or figurative. It captures the action itself as a concept, which makes it the smooth fit for completing the thought. The misspelled option is an obvious error, while the others—“Spanning” and “Crossing”—are valid actions but don’t fit as neatly with the sentence structure in this form, where a noun-phrase describing the act is the natural completion. So the best choice is Bridging the gap.