Which of the following random variables is geometric? A) The number of 5s when rolling a die 35 times
B) The number of spades dealt from a shuffled deck of 52 cards in a seven-card hand
C) The number of heads when a coin is tossed 10 times
D) The number of digits in a randomly selected row until a 9 is found
E) The number of 8s in a row of 20 random digits