can’t handle two

6年前

 
What is the meaning of "can’t handle two"? This sounds pretty strange to me.
“Taking care of a tiny infant is such a difficult chore (19) __________,” Lindburg says. 
The key says F that mother pandas usually can’t handle two 
SOURCE: page 8 question 19 http://elt.dinternal.com.ua/image/data/forTeacher/zno/zno-2017.pdf