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: Based on the user's historical purchases, rank the items in options and predict the next product of the user's interest from the provided options.

Input:
Purchase History:
1st: Under Armour Heatgear Sleeveless Compression Vest. Sports & Outdoors. Sports & Fitness. Under Armour.
2nd: Grizzly by Black Pine 2-Person Sleeping Bag. Sports & Outdoors. Outdoor Recreation. Blackpine Sports.
3rd: Insta Slim 3 Pack Muscle Tank, The Magic is in The Fabric!. Sports & Outdoors. Sports & Fitness. Insta Slim.

Options:
A: Opteka Digital Slide Copier with Detachable Achromatic 10x Macro Lens for Canon EOS 70D, 60D, 60Da, 50D, 1Ds, 7D, 6D, 5D, 5DS, Rebel T6s, T6i,...
B: Fat Daddio's Silicone Bakeware Cylinder, 3 Ounces. Home & Kitchen. Kitchen & Dining. Fat Daddios.
C: MLB Strength Fleece Throw Blanket 50-inch by 60-inch. Sports & Outdoors. Fan Shop. The Northwest Company.
D: Echelon Home Chevron Duvet Cover Set, King, Feather Gray. Home & Kitchen. Bedding. Echelon Home.
E: Winning Edge Deluxe Fishing Life Vest. Sports & Outdoors. Sports & Fitness. Winning Edge.
F: Ebros Coastal Marine Ocean Bottlenose Dolphin Gliding Over Sea Waves Figurine Collectible Dolphin Sculpture. Home & Kitchen. Home Dcor. Ebros Gift.
G: Danco 88956 Pop-Up Stopper, Brass. Home & Kitchen. Bath. Danco.
H: 8 Count Avengers Invitations, Multicolored. Home & Kitchen. Event & Party Supplies. Amscan.
I: Aqua Sphere Vista Lady Swim Mask Goggle, Made In Italy. Sports & Outdoors. Sports & Fitness. Aqua Sphere.
J: Champion Men's Basketball Short. Sports & Outdoors. Sports & Fitness.
K: BOSS AUDIO BV7464B Single-DIN 4.6 inch Touchscreen DVD Player Receiver, Bluetooth. Detachable Front Panel, Wireless Remote. Electronics. Car & Vehicle Electronics. BOSS Audio Systems.
L: Weimoc Flameless Candles, Set of 12 Battery Operated Tea Lights with 6 Hour Timer and Amber Yellow Flame. Home & Kitchen. Home Dcor. Weimoc.
M: Motorola FV300 2-Way Radio, Pair (Discontinued by Manufacturer). Electronics. Portable Audio & Video. Motorola Consumer Radios.
N: Big Joe Flip Lounger, Pink Passion. Home & Kitchen. Furniture. Big Joe.
O: Hallmark Keepsake Ornament Star Wars (Boba Fett). Home & Kitchen. Home Dcor. Star Wars.
P: Polk Audio DB351 3.5-Inch Coaxial Speakers (Pair, Black). Electronics. Car & Vehicle Electronics. Polk Audio.
Q: Crystal by MEE audio In-Ear Headphones with Microphone Made with Swarovski Crystals, Gold. Electronics. Headphones. MEE audio.
R: Zebco 808 Saltwater Fishing Reel with 1BB/7-Feet 2-Piece MH Saltfisher Fishing Rod. Sports & Outdoors. Sports & Fitness. Zebco.
S: Li'l Davinci 9x12 inch Art Frame, Black. Home & Kitchen. Home Dcor. Dynamic Frames.
T: HLC Vintage Leather Laptop Bag 15" Messenger Handmade Briefcase Crossbody Shoulder Bag. Electronics. Computers & Accessories. HLC.


assistant
Answer: R