The correct answer is A. Seige. The correct spelling is siege.
A siege is a military operation in which an armed force surrounds a town or building to capture it by cutting off supplies and communications.
Solemn is an adjective meaning serious, dignified, and earnest.
Syllable is a unit of pronunciation having one vowel sound, with or without surrounding consonants, forming the whole or a part of a word.
Seize is a verb meaning to take or capture by force.