Which direction does thermal energy flow in the following diagram? the picture is of someone holding an ice cream cone

a. heat flows from the ice cream to the hand.
b. heat flows from the hand to the ice cream.
c. the system is in a state of equilibrium.
d. the system is too cold for heat to move.

The thermal energy flow would require a source to get transferred to an object which has less thermal energy than the source. Here, the energy source is a person and the object is ice-cream. The source of thermal energy will be in a person and the energy will flow from the hand of the person to the ice-cream as there is low thermal energy in ice-cream.

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considering the question as per the attachment

here we can see that the radon nuclide has 222 as the atomic mass number and 86 as the atomic number.

when it undergoes nuclear fission it gives polonium which has atomic mass number as 218 and atomic number will be 84 along with a helium nucleus which has 4 atomic mass number and 2 as its atomic number.

222 = 218 + 4 (atomic mass number)

86 = ? + 2; therefore ? = 86-2 = 84.

the atomic mass number of polonium will be 84.