The mountain lion watched as her cubs gamboled happily in the meadow, pouncing and sprining upon each other.
-ate hungrily
-hunted silently
-romped playfully
-attacked fiercely

romped playfully.

Explanation:

The word 'gambol' means 'to run or jump about playfully'. Looking at the given sentence in this way, we can be certain that the cubs were playing, or in a playful manner. Also, 'to romp' means to 'play roughly or playfully' which is also another indication of the cubs playing. So, among the various options given, the correct answer to the sentence given will be

The mountain lion watched as her cubs romped playfully (GAMBOLED) happily in the meadow.

i agree definitely that

invention of the washing machine

in the past, people used sticks and stones or scrub boards to clean their clothing. as it was sweaty, backbreaking work, we owe a world of to james king because he created the model for the modern washing machine in 1851. the most important issue was that this machine cleaned clothes while a person cranked the handle. doing this made people who used it develop strong muscles in their arms. later, in 1908, alva j. fisher created an electric washing machine named thor. this one was not the first automatic washing machine. however, it was one of the most popular models at the time.