Task: Sequential_Recommendation

system
You are a helpful assistant. The assistant first thinks about the reasoning process in the mind by using Belief-Desire-Intention (BDI) framework and then provides the user with the answer. The reasoning process and answer are enclosed within <think> </think> and <answer> </answer> tags, respectively. 
Below is an instruction that describes a task. After thinking, when you finally reach a conclusion based on the customer's intention, desire and belief, clearly state the BDI thinking process within <think> </think> and then the answer within <answer> </answer> tags.


user 
Instruction: Rank the items in options and predict the user's next purchase from the listed options by analyzing her historical purchases.

Input:
Purchase History:
1st: WD My Passport 2TB Portable External USB 3.0 Hard Drive Storage Black (WDBY8L0020BBK-NESN). Electronics. Computers & Accessories. Western Digital.
2nd: Acer Iconia A1-810-L416 7.9-Inch 16 GB Tablet (Pure White). Electronics. Computers & Accessories. Acer.

Options:
A: Zing BLUE 502-202 Large Neoprene Camera Case for DSLR Cameras with 18-55mm lens, 50mm or 55-200mm lens. Electronics. Camera & Photo. Zing.
B: Speedo Men's Marina Volley 2.0 Watershorts. Sports & Outdoors. Outdoor Recreation. Speedo.
C: Whistler CR93 Laser/Radar Detector. Electronics. Car & Vehicle Electronics. Whistler.
D: Linksys RE2000 N600 Dual-Band Wireless Range Extender. Electronics. Computers & Accessories. Linksys.
E: Sony XLRK1M Balanced Audio Adapter for Alpha Camera (Black). Electronics. Camera & Photo. Sony.
F: AGM Airsoft 29-Round Magazine MK96 AWP Type 96 Sniper Rifle. Sports & Outdoors. Sports & Fitness. AGM.
G: H Potter Craftsman Candle Lantern Decorative Table Top Indoor Outdoor Patio Candle Holder Small. Home & Kitchen. Home Dcor. H Potter.
H: Black Diamond Rocklock Locking Carabiner. Sports & Outdoors. Outdoor Recreation. Black Diamond.
I: Monoprice 2-Port Surface Mount Box (107089). Electronics. Computers & Accessories. Monoprice.
J: Tablecraft (724D) 1 Cup Stainless Steel Measuring Cup. Home & Kitchen. Kitchen & Dining. Tablecraft.
K: Bomber Jointed Long A Fishing Lures. Sports & Outdoors. Sports & Fitness. Bomber.
L: 360 Knife Block - (Blonde Bamboo) ROTATING - Magnetic - BEST Universal Knife Block. Home & Kitchen. Kitchen & Dining. 360 Knife Block.
M: Mitsubishi AWNU231 IEEE 802.11n USB Wi-Fi Adapter (Discontinued by Manufacturer). Electronics. Computers & Accessories. Mitsubishi.
N: Hallmark QX9103 Four Calling Birds 4th in the Twelve Days of Christmas Series. Home & Kitchen. Home Dcor. Hallmark.
O: Froz Ice Ball Maker – Novelty Food-Grade Silicone Ice Mold Tray With 4 X 4.5cm Ball Capacity. Home & Kitchen. Kitchen & Dining. Housewares Solutions.
P: GIGABYTE Brix Ultra Compact PC Intel i5-4200U 2.6/1.6 GHz Wi-Fi/BT4.0 Processor (GB-BXi5-4200). Electronics. Computers & Accessories. Gigabyte.
Q: NTK Premium For iTouch iPod Touch 4 4G Silicone Case with Hard Shell Inside Case With Built In Touch Screen Protector Film 2 Layer Case...
R: Skullcandy Hesh 2.0 Headphones - White. Electronics. Headphones. Skullcandy.
S: Yaesu Vertex CSC-93 Vinyl Case for VX-8DR & VX-8R Handheld Transceiver. Electronics. Portable Audio & Video. Yaesu.
T: Gateway ZX4665-UR11 19-Inch All-in-One Desktop (Black) (Discontinued by Manufacturer). Electronics. Computers & Accessories. Gateway.


assistant
Answer: R