Phosphorus can react with various elements to form stable compounds. Among the options provided, phosphorus can indeed react with bromine to form phosphorus dibromide (PBr2). Additionally, phosphorus can also react with lithium to form lithium phosphide (Li3P), though the example given (LiP) is not a common or stable formulation. Phosphorus can react with gallium but the stability may depend on the specific conditions and oxidation states involved.
If you're looking for a straightforward answer to which element creates a stable compound with phosphorus from your options, it would be correct to say phosphorus reacts with bromine to form PBr2.