In this task, you are given a context and four options. Each option is a suggested ending for the context. You should read the context and pick the best ending for the context. Please answer with "A", "B", "C", and "D". 

[header] How to recognize chickenpox [title] Watch for symptoms on the skin. [step] Approximately one or two days after developing a runny nose and sneezing, you may see red spots on your skin. These dots often start on the chest, face, and back, are often itchy, and can quickly spread to the rest of the body. <sep> (A) [substeps] When this occurs, it may also be due to a new virus. If you experience any major allergic reactions to chickenpox, such as hives or rashes, contact the doctor. (B) If you suspect that you may have chickenpox, you can easily detect these signs and get medical care. [substeps] These red itchy spots may be small, crisp, or feel tight when you press them onto your skin. (C) [substeps] If you are experiencing a runny nose, you may also develop a flu or fever the following day after taking chickenpox. Syphilis, the " natural flu, " often shows up early in the infection, and even greater in children. (D) [substeps] These red spots will turn into red bumps and then small blisters (vesicles). These spots contain the virus and are highly contagious.
D

A man appears in a white t-shirt and black pants, barefoot and begins to showcase martial arts moves. The man begins using moves that exhibit floor work and light tumbles along with a headstand. the man <sep> (A) then gets a table lined with 5 different obstacles and walks around with the across object. (B) continues using moves that are dark and completely off the vic to show talent. (C) progresses into controlled somersaults and side to side work along with high kicks. (D) pauses for a second and then starts to demonstrate more moves and touch tone.
C

[header] How to track a flight on flightaware [title] Visit the flightaware website. [title] Find which flight you need to track. [step] You can track the flights to and from a given airport or by individual airline and flight number. <sep> (A) [substeps] This can be done by accessing the flightaware app on your mobile device. This app is great because if you have an internet connection you can track a lot. (B) Flightaware hosts for free the link to their tracking websites. [substeps] You can also download the flightaware website here: https: // flighta.com/this will tell you a number of different sites where you can track flights to and from. (C) [substeps] If you need to know the airport code, you can check out how to look up airport codes to help. The system will try to search for these airports and airlines as you type, so select from the drop-down box if you spot the right one. (D) [substeps] Click on the button you see through the flightaware tab (toggle right). This will bring out a header-drop box below the boxes listed.

C