OG 151 没有if的条件状语从句

151. If Dr. Wade was right, any apparent connection of the eating of highly processed foods and excelling at sports is purely coincidental.

(A)  If Dr. Wade was right, any apparent connection of the eating of

(B)   Should Dr. Wade be right, any apparent connection of eating

(C)  If Dr. Wade is right, any connection that is apparent between eating of

(D)  If Dr. Wade is right, any apparent connection between eating

(E)   Should Dr. Wade have been right, any connec­tion apparent between eating

D, the best choice, deals successfully with four issues. It uses a present indicative verb form in the conditional clause. If Dr. Wade is right, in order to agree with the verb in the main clause, any connection is...coincidental. It uses the idiomatic phrasing connection between x and y. It presents the coordinate objects of the preposition between (eating ... and excelling ...) in parallel form. Finally, the adjective apparent appears in front of its headnoun connection, not after. A, B, and E use incorrect verb forms in the conditional clause. A and B use the unidiomatic connection of x and y. A and C violate parallelism with eating of. C and E incorrectly place apparent after its head­word connection.

我想问问B中这种没有if的条件状语从句的用法。
有没有哪位nn有总结过具体的形式和使用方式啊？ 还有就是，是不是这种没有if的条件从句都是表示的虚拟语气呢？ 谢谢了