Question

I think the key to success is not mess- first few shots.
(a) in
(b) on
(c) up
(d) at​

Answer 1

I think so the answer is up

Answer 2

I think the key to success is not mess up first few shots.

Option (c)

EXPLANATION:

• 'Prepositions' are words generally used to connect pronouns, phrases, or nouns to other words win a sentence. Prepositions connect objects, people, location and time of a sentence. They are usually 'short words', and they are placed in front of nouns.
• As a preposition up is used to talk about movement or position in to an upper or more vital place or degree, and so on. Metaphorical uses of up such as talk-up, stand-up for are usually derived from its use as a directional preposition. Up is used to suggest rise and is closely connected to envisaging its meaning as a directional preposition such as 'make-up, loosen-up, drive-up, follow-up, liven-up', and so on.  
• A phrasal verb combines with a preposition or an adverb. The combination creates a new meaning, often one that is not associated the meaning of the base verb and is tough to deduce. Up when used with the phrasal verb, will give another meaning to the combination and the meaning depends on the context   If you mess something up or if you mess up, it implies mishandling a situation or making something to be spoiled or to fail.

To know more about Prepositions

Fill in appropriate preposition. The race was ---------------- to begin ​

brainly.in/question/12387136

Write---------me soon(preposition)

brainly.in/question/1184977