The most likely answer would be C if the topic is toddlers.
HOWEVER if their is no information to support that it is about toddlers in your marital then it is most likely D.
A reader can found the main idea of a passage by analyzing the connotation of the words, summarize the passage and entering details into a graphic organizer. Analyzing the meaning of each word in the text and summarizing is very important in understanding what message it conveys. Also, using a graphic organizer would lead you to finding the main idea of the passage as it highlights the important parts of the text.
B. is the answer, I think.
The answer is PLURAL.
Because children is plural and faces is plural. When something is singular, it is by itself, there is no more than the amount of one. Plural means two or more.