Atp is composed of an adenosine molecule and phosphates.

The right answer is three phosphates.

Adenosine is a nucleoside formed by adenine that is attached to a ribose (it's a base+sugar molecule).

ATP is composed of adenine, ribose and three phosphate groups forming a triphosphate group. These three phosphate groups are designated, from the ribose outwards, by the Greek letters α (alpha), β (beta) and γ (gamma). ATP is therefore closely related to AMP, one of the monomers of RNA, and to dAMP, one of the monomers of DNA. ATP is very soluble in water. It remains relatively stable in aqueous solution for pHs between 6.8 and 7.4, but is rapidly hydrolysed to more acidic or more basic pH. Therefore, ATP is best preserved as an anhydrous salt.

ATP is made up of adenosine olecule and three phosphate.

Explanation:

ATP is the energy currency of the cell and help to store energy in the form of high energy phosphate bonds. ATP contains adenosine moiety which has three phosphoryl groups attached with it through phosphoester bond which is followed by two phosphoanhydride bonds.  

ATP is produced during cellular respiration in which glucose is oxidized to carbon dioxide by a series of reactions. ATP makes a link between the catabolism process and anabolism process.  

It donates a high energy phosphate bond when energy is required by the cell and converts into ADP. So ATP  is composed of an adenosine molecule and three phosphates.