Which sentence contains a split infinitive?
(its a probably)
a. young children seem to thoroughly enjoy playing with soap bubbles and shaving cream.
b. it is important to give children opportunities to explore their world through sensory experiences.
c. clay and finger paints are often used to prepare children for writing and drawing.
d. going to preschool opens the door to learning and encourages kindergarten readiness.

The sentence that contains a split infinitive is sentence A: Young children seeem to thoroughly enjoy playing with soap bubbles and shaving cream.

Explanation:

A split infinitive is created by placing an adverb or adverbial phrase between the inifinitive particicle and the verb. In this case, the adverb "thoroughly" is between said elements. In the other sentences, there isn't any element separating the particle from the verb.

the reason some people sacrifice their own life for another person's life could be that they are in love with them and would do anything to keep them safe a protected even if that means risking their life in the process