Under Which of the Following Scenarios Would a Court Most

Under which of the following scenarios would a court most likely invalidate the contract with Porter?

A) If Porter knew the "standard-size" switchplates were not the proper size for Elton's blenders,and Elton's mistake in calculating the size needed was a clerical error.
B) If Elton assumed the switchplate was the standard size.
C) If Elton's mistake in measuring the size of the switchplate needed was a clerical error.
D) If Elton's technician "eyeballed" the size needed for the blender.
E) If Elton wrote the wrong switchplate size in an email to Porter and that size was the same as the standard size.