When the pinto cars made by ford were increasingly involved in fatal rear-crash accidents, ford officials made a decision to discontinue that model. their decision was a(n) change.
a. retroactive
b. reactive
c. inactive
d. proactive

option B

Explanation:

The correct answer is option B

Reactive change is a step taken when forces compel the organization to implement changes.                                        

When the Pinto car by Ford is involved in fatal crash accidents, these incident force the official to discontinue the model. this decision is a reactive change.                                  If the company were Proactive then he would have dealt with the issue beforehand.                                    

It is better to be Proactive than Reactive.      

an obstruction

multiple allele inheritance is traits controlled by more than 2 alleles (ex: pigeons having 3 alleles of one gene govern their feather color).