Question

There is no end to the logical_____that he has shared with us today. In fact, I would posit that nothing in this speech was factually credible

A: Biased
B: Predictable
C: Validity
D: Fallacies

Answer 1

Fallacies as in inaccuracies, errors, or faults. Hope this helped.

Answer 2

The correct answer is D. fallacies.
Logical fallacies are faults in somebody's logic - inaccuracies, wrong deductions and information, false details and conclusions, etc. A and B are definitely incorrect even if you don't know what they are - these are adjectives and don't fit into this sentence because we need a noun. C is also incorrect because that noun has to be plural in this context.