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Ruby, 57 bytes ->a,b,c{%w[+ - * / % **].select{c==a.send(_1,b)rescue p}} Attempt This Online!
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# [Ruby](https://www.ruby-lang.org/), 57 bytes <pre><code class="lang-ruby">->a,b,c{%w[+ - * / % **].select{c==a.send(_1,b)rescue p}}</code></pre> [Attempt This Online!](https://ato.pxeger.com/run?1=Pc9LDoIwEAbgPaeYxJBomfKooLAoFyFopMLKGMIjxhBO4oYYPYGn8TZWxrpq8-Wfv9Pbo-mL63Sv5LPvKh6_E54esEA12JfMAQ4MPLCBsdxty1OpukFJedD383G5D7BYNWWr-hLqcfwVvGqoMoFrjHJYyBQc6wtbDYLAmyHBGEMCd4YAhUkwizqESTh6jR2lQtxgTMpnidA3c1TkawgIaEY_hD6B_U_4pll_0aLVp4nODw)