<p>The correct answer is <strong>(A) available</strong>.</p><p>This sentence requires an adjective after "be made" to describe the state or quality of the "new treatments and vaccines." The structure of the sentence is talking about the possibility ("whether") of treatments and vaccines "being developed" and their subsequent distribution or accessibility. (A) "available" is an adjective, which means able to be used or obtained; at someone's disposal. In the context of this sentence, "available" correctly describes the desired state of the new treatments and vaccines - that they can be obtained or accessed.</p>
<p>The other options are not suitable because:</p>
<p>(B) "availability" is a noun that refers to the state of being available, not the quality of being made.</p>
<p>(C) "avail" is a verb that means to take advantage of or benefit from something. It does not describe the quality of being made.</p>
<p>(D) "availably" is not a valid adjective form of "available."</p>