Correct Answer: looked up

Solution : The correct choice is the second option .

In the context of searching for information, " looked up" is the most appropriate option. When we say "Simon looked up the contact details," it means he searched for or consulted a source, such as a telephone directory, to find the required information.

The meanings of other phrases are:

• Looked after : This phrase means to take care of or attend to someone or something.
• Went On : This means continuing an action, proceeding with an activity, or expressing what someone said or did.
• Looked into : This means to examine the facts about a problem or situation.