Answer: The molecule identified with the letter C. HFO.
Step-by-step explanation:
1) In covalent bonds, the dipoles are identified with an arrow pointing from the least electronegative element toward the most electronegative element.
2) The molecule HFO is formed by one covalent bond between H and O, and other covalent bond between F and O.
3) O is more electronegative than H, so in the H-O bond the dipole is identified with the arrow from the H atom toward the O atom. That is correctly indicated in the drawing C, in this way:
-|----→
H - O
4) F is more electronegative than O, so in the O-F bond the dipole is identified with an arrow from the O atom toward the F atom. That is correctly indicated in this way:
-|---→
O - F.