Before reading a percentage: who is in the denominator?

Fictional learning example, not ELYADAL participant data or results of a real study.
200 known-eligible invitees; 120 responses, all answering the question.
30 chose A; 90 chose other options; 80 responses are missing.
30/120 = 25% of respondents chose A.
30/200 = 15% of invitees were observed to answer A; nonrespondent preferences are unknown.
80/200 = 40% missing responses in this simple example.
Missing is not a negative answer. Do not treat 120/200 as a universal AAPOR response-rate formula.
Source: https://aapor.org/standards-and-ethics/standard-definitions/

MY RECORD
Question: ____
Numerator: ____
Denominator: ____
Missing records: ____
Statement supported by the source: ____