Mr. Alex Burrow is a member of a group disability benefit plan sponsored by his employer. During 2020, Mr. Burrow was required to contribute $300 to this plan. During 2021, his employer's share of the annual premium was $1,800. During 2021, Mr. Burrow became disabled and filed a claim that provided $5,250 in benefits from the disability plan. He had only contributed $225 to plan in 2021. What amount will Mr. Burrow include in his 2021 employment income? (4 marks) A) $1,575 B) $1,800 C) $5,025 D) $5.250 E) None of the above