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

Input:
1st: MudGear Premium Compression Socks - Mens & Womens Running Hiking Trail (1 Pair). Sports & Outdoors. Sports & Fitness. MudGear.
2nd: ProSource High Density Extra Firm Foam Roller for Muscle Massage and Core Exercises. Sports & Outdoors. Sports & Fitness. ProSource.
3rd: Mares Rash Guard Shorts - Mens for Scuba Diving, Snorkeling and Water Sports. Sports & Outdoors. Outdoor Recreation. Mares.
4th: TETON Sports TrailRunner 2.0 Hydration Pack; Free 2-Liter Hydration Bladder; For Backpacking, Hiking, Running, Cycling, and Climbing. Sports & Outdoors. Outdoor Recreation. TETON Sports.

Options:
A: PWR+ CAR Charger 90W for Lenovo T410 T420 T430 G550 G570 G580 B570 V570 Y710 Z580 Miix 510 520 510s IdeaPad 110 310 320 710s...
B: DreamFoam Bedding 2" Gel Swirl Memory Foam Topper, Made in USA,Full/X-Large. Home & Kitchen. Bedding. Dreamfoam Bedding.
C: Pink Flower Area Rug for Kids Girls Room, Girls Area Rugs, Girls Room & Baby Nursery Floor Rugs, Kids Room Decorative 25" Daisy Flower Pink...
D: Caldwell Handy Rest NXT Adjustable Ambidextrous Rifle Pistol Handgun Shooting Rest for Outdoor Range. Sports & Outdoors. Sports & Fitness. Caldwell.
E: Nikon D80 DSLR Camera (Body only) (OLD MODEL). Electronics. Camera & Photo. Nikon.
F: UNITEK Aluminum USB 3.0 to SATA Hard Drive Docking Station with 2-Port Hub and SD Card Reader for 2.5 & 3.5 Inch HDD SSD SATA...
G: White Performance Folding Fan #3000. Home & Kitchen. Home Dcor. House of Rice.
H: Jennice House Chef Aprons Professional Kitchen Chef Works Chalk Stripe Bib Apron with Pockets Adjustable Neck Strap Long Waist Ties 100% Pure Cotton Apron in...
I: Fintie Acer Aspire Switch 10 SW5 Folio Case, 2-in-1 Premium Vegan Leather Keyboard Portfolio Stand Cover For Acer Aspire Switch 10 SW5-012 10.1-Inch Tablet PC,...
J: City Truck Children Area Rug 39"x58". Home & Kitchen. Home Dcor. Spectrumrug.
K: Frog Spit Anti-Fog 2 oz Bottle. Sports & Outdoors. Outdoor Recreation. Innovative Scuba Concepts.
L: Primitives by Kathy 21338 Floral Trimmed Box Sign, 4" x 4.5", You and I. Home & Kitchen. Home Dcor. Primitives by Kathy.
M: Canon ACK-DC20 AC Adapter Kit for PowerShot G7, G9 and Digital Rebel XT/XTi. Electronics. Camera & Photo. Canon.
N: CMC Pro - Powered byTY Technology Watershield Glossy White Inkjet Hub 16X DVD-R - 50-Pack. Electronics. Accessories & Supplies. CMC Pro - Powered by TY...
O: IHF Home Decor Blackberry Oval Jute Braided Area Rug Floor Carpet 5 x 8 Feet. Home & Kitchen. Home Dcor. IHF Home Decor.
P: New Era NFL 2014 On-Field Knit Hat. Sports & Outdoors. Fan Shop. New Era.
Q: Home Basics Triangle Hairdryer Holder and Organizer. Home & Kitchen. Bath. Home Basics.
R: Osprey Daylite Backpack, Tundra Green, O/S . Sports & Outdoors. Outdoor Recreation. Osprey.
S: Multi-function Pan Protectors , Help to Stack Your Pot, Pan Bowl and Dishes Without Scratching Them, a Set of 8 (Green Flower) By CTD Store...
T: AWEI® ES-Q3 In-Ear Noise Isolation with Precise Bass 3.5mm Plug Earphone for iPhone 4/4S/5/5S iPod Mp3 Mp4 Samsung HTC (Golden). Electronics. Headphones. AWEI.
Answer: R