Correct

效忠

/ xiàozhōng / 
Strokes

Definition

to vow loyalty and devotion to

Example

As a Verb

pledge loyalty to; devote oneself heart and soul to

1
Xuānshì
宣誓
xiàozhōng
效忠

make a pledge of allegiance (to)

2
Fāshì
发誓
xiàozhōng
效忠
zǔguó
祖国

pledge allegiance/loyalty to the country