Question

when did he find the cause of a viral disease common among caterpillar
A)in 7th standard
b)in 8th standard
C) in college
D)none of the above​

Answer 1

none of the above. ...is the answer according to me

Answer 2

He found the cause of virus diseases common among caterpillar in his 8th grade project

• Richard Ebright started various experiments and projects.  

• For his 8th-grade project, he tried discovering the cause of a viral disease that killed nearly all monarch caterpillars every few years.  

• He tried rising caterpillars in the presence of beetles as he believed the disease might have been supported by a beetle. He did not get any results.  

• Though, he went ahead and exposed that he had tried the experiment, and this time he won.

Hope it helped...