In the second sentence they have given as the heart is inferior to the diaphragm, but it is superior in terms of anatomy.
Therefore, the option (b) is also incorrect answer.
In the fourth sentence the wrist is proximal to the elbow, which means nearer and it is wrong because it is distal.
So the option (d) is incorrect answer.
In the third sentence the hip is proximal to the knee is given, which is a correct sentence as the hip is nearer to the knee.
So, the is the correct answer.