Reaction to form amino acid
The starting compound is an organic compound known as acrolein. $\ce{CH2=CH-CH=O}$
Now your first reaction would be:
$$\ce{CH2=CH-CH=O -&gt;[CH3SH][1,4 addition]CH3-S-CH2-CH=CH-OH} $$
Now, this compound tautomerizes to form methional
$$\ce{CH3-S-CH2-CH=CH-OH &lt;-&gt; CH3-S-CH2-CH2-CH=O}$$
Now, the second step in your reaction is a named reaction known as Strecker Amino Acid Synthesis. This converts an methional (in this case) into methionine.

Now, onto the question at hand, it asks about certain properties of methionine. Methionine is an essential amino acid. So A is correct. Since methionine doesn't have any extra acid or base groups, it is neutral.
As for the Lassaigne Test, if the compound had only nitrogen, it would have shown a prussian blue color. However since there is sulphur as well, it shows a violet colouration. So, the answer is A.