💡 Detailed Explanation
The noun 'お見舞い' (omimai) refers to visiting or sending gifts to someone who is sick, injured, or suffering from a disaster to show sympathy and support. Option 1 is correct: 'I went to visit/express sympathy to a friend who is hospitalized with a cold.' Options 2 and 3 are incorrect because presenting cakes to a teacher or flowers on a friend's birthday is a 'プレゼント' (present) or 'お祝い' (celebration / gift), not 'お見舞い'. Option 4 is incorrect because buying souvenirs during travel uses 'お土産' (omiyage), not 'お見舞い'.