The volleyball team needs new uniforms. The students plan to sell plush toy eagles (the school​ mascot) for​ $5 each. The students find three companies​ on-line that sell stuffed mascots. Company A sells 12 eagles for ​$34.56. Company B sells 15 eagles for ​$42.90. Company C charges ​$51.30 for 18 eagles. Which company has the best​ buy?