Which one of these variables is a continuous random variable

Which one of these variables is a continuous random variable?

The time it takes a randomly selected student to complete an exam.

The number of tattoos a randomly selected person has.

The number of women taller than 68 inches in a random sample of 5 women.

The number of correct guesses on a multiple choice test.

A binomial experiment is a probability experiment that satisfies the following requirements:

Trials have two mutually exclusive outcomes considered as either success or failure, and are independent each other.

1)
A. The time it takes a randomly selected student to complete an exam.

All of these