Idont understand this.. in a bond between an atom of carbon and an atom of fluorine, the fluorine atom has a?
a. weaker attraction for electrons
b. stronger attraction for electrons
c. smaller number of first-shell electrons
d. larger number of first-shell electrons

The correct answer is B.

Look into period table of elements at electronegativity.
Electronegativity of carbon is 2.5 and of fluorine 4.0.
Electronegativity is a strenght/ability to attract electrons.

Fluorine eletronegativity is much higher so it's atom has stronger attraction of electrons.

Daniel and Maria will win because they are exerting more force.