Correct Answer: Extarnal

Solution : The third option is the correct answer.

The incorrectly spelt word is extarnal. The correct spelling is external, relating to or located on the outside.

The meanings of the other options are as follows:

• Musk is a strong-smelling reddish-brown substance obtained from a gland of the male musk deer, often used in perfumes.
• Decide means to make a choice or reach a conclusion.
• An angel is a supernatural being, often depicted as benevolent and divine.