If you stung by a honey bee. why we suggest rub with baking soda why?​

When a bee stings, it injects methanoic acid into the skin which causes immense pain and irritation. Rubbing of baking soda on the sting area gives relief because, being alkaline in nature, baking soda neutralizes the effect of methanoic acid and gives relief.

b) phosphorus pentoxide

real, smaller and upside-down.   so the answer should be b.