Step 1: Understand the dispute.
A Safai Karamchari working in a charitable trust was terminated for repeated absence. The trust argued it is not an industry under Section 2(j) of the Industrial Disputes Act, 1947, so the worker is not a workman and Section 25-F does not apply.
Step 2: Read the Assertion (A).
(A) describes this exact challenge - a charitable employer trying to say it is not an industry to avoid worker protections. This is a real and common kind of legal challenge, so (A) is true.
Step 3: Read the Reason (R).
(R) says the trust ran many activities, including commercial ventures, hired employees in an organized way and paid proper remuneration. These facts about organized, systematic activity are true.
Step 4: Recall the Triple Test.
The Bangalore Water Supply case gave the Triple Test: systematic activity, cooperation between employer and employees, and producing goods or services. If these are met, even a charitable body is an industry. The facts in (R) meet this test.
Step 5: Does (R) explain (A).
Because the trust runs organized activities (the point in R), it does fall within industry under Section 2(j). That is precisely why the trust's argument in (A) would fail. So (R) explains and answers (A).
Step 6: Conclude.
Both (A) and (R) are true, and (R) is the correct explanation of (A).
\[ \boxed{\text{Both (A) and (R) are true, and (R) is the correct explanation of (A).}} \]