Which word from the paragraph the reader understand the meaning of the underlined word?

" spare me, i beseech you," the mouse pleaded with the lion. "though i am a lowly mouse, you never know when i might come to your aid. even the mighty king of the beasts needs at times, and if you release me today, i will be able to rescue you in the future! "
the lion merely chuckled in reply.

a.
chuckled

b.
pleaded

c.
spare

d.
rescue