How would a bar magnet orient itself to this planet’s magnetic field
a.) a
b.) b
c.) c
d.)d

A bar magnet orient itself to the opposite polarity of planet’s magnetic field  

As we know that the earth acts like a very big but a weak magnet and that's why compasses point north. If we take a bar magnet and let it hang freely by the help of a string then we will see that the magnet's north pole would point to the Earth's south pole. and the magnet's south pole would point to the Earth's north pole and that is because we know that opposite poles attract each other.

tsd is temerature dependent sex determination.

tsd: it is a type of environmental sex determination in which the temperature experienced during embryonic/ larval development (ambient temperature for development) determine the sex of the offspring.

crocodile displays the tsd where the ambient temperature of the developing egg determines the individual's sex. for example in the american alligator's eggs, incubation at 33 ºc produces mostly males, while incubation at 30 ºc produces mostly females. so if the american alligator's egg will get the ambient temperature (33 degree celcius)during embryonic development from egg, the offspring will be male and same for the female sex determination.