Answer: A) Touch.
Step-by-step explanation: A simile is a comparison between elements that aren't obviously related, it uses words like "like" and "as" to make the comparison. In the given excerpt, we can see the use of a simile in the first sentence, comparing the feeling of a petal with the one of silk, this first sentence and also the phrase "her father gently brushed a tear from her face" are mainly appealing to the sense of touch.