It’s option c.
But actually water has both covalent and ionic characteristics. It is 33% ionic and 67% covalent, so it’s not right to say that it’s made up of two positive H and an oxygen atom with negative charge.
With regards to four options given third is most relevant one.
This regulatory mechanism is in conjunction with the endocrine system, particularly in the posterior pituitary gland. This is related in the secretion of vasopressin or antidiuretic hormone (ADH). In the event of dehydration or extreme thirst, the body will conserve as much fluid as possible and the posterior pituitary will secrete more ADH that will signal the kidney to reabsorb more water in the collecting tubules.
A trna with the anticodon sequence 5′ iua 3′ will not normally exist because 5′ UAA 3′ is a stop codon.
There are three stop/termination codons UAA, UAG, and UGA.
A unique type of RNA molecule is called a transfer RNA (tRNA). Matching an mRNA codon to the amino acid it codes for is its responsibility. Anticodon is a set of three nucleotides found in each tRNA. One or more distinct mRNA codons can bind to the anticodon of a particular tRNA. The amino acid encoded by the codons to which the tRNA binds is carried by the tRNA molecule as well.
At the third position of the codon, atypical base pairs—between nucleotides other than A-U and G-C—can develop. This phenomenon is referred to as wobble.
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The number of neutrons in each atom