For Question 1:
when “花 (huā)” is used as a noun, it refers to flowers, while when “花 (huā)” is used as a verb, it means to spend. Therefore, the correct answer is C.
For Question 2:
Wǒ jīntiān huā le liǎng bǎi kuài qián.
I have spent 200 yuan today.
花 (Huā) n./v. flower/to spend (money)
丢 (Diū) v./adj. throw/lost
挣 (Zhèng) v. strive, endeavor, struggle
Wǒ jīntiān diū le liǎng bǎi kuài qián.
I lost 200 yuan today.
Wǒ jīntiān zhèng le liǎng bǎi kuài qián.
I earned 200 Yuan today.
“To spend” is one of the meanings of “花 (huā)” so the correct answer is A.